| P10141 | Academy of Athens authority ID |
| P9252 | Amathus ID |
| P9097 | American Academy in Rome ID |
| P9409 | American University of Beirut's Libraries title ID |
| P5731 | Angelicum ID |
| P8944 | Archivio dei possessori ID |
| P12707 | Authority file of the Iraqi Authors ID |
| P3964 | BDCYL authority ID |
| P11959 | BHL item ID |
| P6211 | BIBSYS work ID |
| P1143 | BN (Argentine) editions |
| P5691 | BND ID |
| P3788 | BNMM authority ID |
| P9117 | BVFE author ID |
| P6907 | BVLarramendi ID |
| P4802 | BVPB authority ID |
| P6492 | BVPH authority ID |
| P2961 | BVPH publication ID |
| P9504 | Beirut Arab University's Libraries title ID |
| P9178 | Biblioteca Franco Serantini ID |
| P9179 | Biblioteca Iglesia Nacional Española en Roma ID |
| P4440 | Biblioteca Nacional de México ID |
| P6496 | Biblioteca Virtual Andalucía authority ID |
| P11936 | Biblioteca centrale Cappuccini authority ID |
| P9522 | Biblioteca di Santa Sabina ID |
| P9534 | Biblioteche della Custodia di Terra Santa a Gerusalemme ID |
| P6173 | Bitraga author ID |
| P6175 | Bitraga work ID |
| P10375 | Boris Yeltsin Presidential Library ID |
| P5199 | British Library system number |
| P270 | CALIS ID |
| P1890 | CCAB ID |
| P6493 | CCBAE publication ID |
| P1871 | CERL Thesaurus ID |
| P8848 | CONOR.AL ID |
| P8849 | CONOR.BG ID |
| P8850 | CONOR.KS ID |
| P8851 | CONOR.SR ID |
| P10075 | CREPČ institution ID |
| P10076 | CREPČ person ID |
| P1670 | Canadiana Authorities ID (former scheme) |
| P9282 | Catalogue of the Capitular Library of Verona author ID |
| P11180 | Central Library of Volos authority ID |
| P7865 | CoBiS author ID |
| P9287 | Cyprus Bibliography ID |
| P9250 | Cyprus Library ID |
| P9251 | Cyprus University of Technology ID |
| P3184 | Czech National Bibliography ID |
| P2456 | DBLP author ID |
| P8122 | DLL Catalog author ID |
| P8123 | DLL Catalog work ID |
| P8795 | Diamond Catalogue ID for persons and organisations |
| P3932 | Digital Valencian Library author ID |
| P11158 | Dimitri and Aliki Perrotis Central Library ID |
| P9661 | EBAF authority ID |
| P11243 | EPA ID |
| P1084 | EUL editions |
| P4672 | Early Modern Letters Online location ID |
| P1802 | Early Modern Letters Online person ID |
| P9253 | European University Cyprus ID |
| P9678 | Franciscan Center of Christian Oriental Studies ID |
| P3307 | Galiciana authority ID |
| P3004 | Galiciana work ID |
| P5909 | HKCAN ID |
| P1844 | HathiTrust ID |
| P9943 | Hill Museum & Manuscript Library ID |
| P10518 | ICCROM authority ID |
| P9871 | INAPP author ID |
| P9874 | INAPP work ID |
| P9861 | Iași Central University Library ID |
| P10662 | IndexCat ID |
| P2687 | JPNO |
| P8223 | K-Scholar ID |
| P8980 | KANTO ID |
| P11249 | KBR person ID |
| P9964 | Kalliope-Verbund (GND) ID |
| P9918 | Kallías ID |
| P9337 | Keratsini-Drapetsona libraries' catalogue authority ID |
| P1182 | LIBRIS editions |
| P4760 | LTI Korea Library writer ID |
| P11185 | Levadia Library ID |
| P2879 | Library of the National Congress of Argentina ID |
| P2623 | MEK ID |
| P11156 | MMB ID |
| P11179 | MSVF ID |
| P11155 | Municipal Library of Trikala ID |
| P8947 | Museo Galileo authority ID |
| P1739 | NACSIS-CAT bibliography ID |
| P1048 | NCL ID |
| P1054 | NDL Bib ID |
| P9836 | NDL Persistent ID |
| P1315 | NLA Trove people ID |
| P3390 | NLB authority ID |
| P1213 | NLC authorities |
| P1695 | NLP ID (old) |
| P3959 | NNL item ID |
| P951 | NSZL (VIAF) ID |
| P11097 | National Library of Indonesia Control Headings ID |
| P949 | National Library of Israel ID (old) |
| P7682 | National Library of New Zealand ID |
| P1003 | National Library of Romania ID |
| P12595 | National Library of Uruguay authority ID |
| P2966 | National Library of Wales Authority ID |
| P6786 | National Library of Wales Catalogue ID |
| P7472 | National Marine Biological Library ID |
| P243 | OCLC control number |
| P5331 | OCLC work ID |
| P11154 | OMED ID |
| P648 | Open Library ID |
| P11518 | Oroklini Library ID |
| P12458 | Parsifal cluster ID |
| P6490 | Patrimonio Digital de Castilla-La Mancha authority ID |
| P11192 | Piraeus Bank Group Cultural Foundation Library (A) ID |
| P11193 | Piraeus Bank Group Cultural Foundation Library (B) ID |
| P9247 | Pontifical University of Salamanca ID |
| P5739 | Pontificia Università della Santa Croce ID |
| P8982 | Pontificio Istituto di Archeologia Cristiana ID |
| P6373 | Portuguese National Library work ID |
| P1463 | Post-Reformation Digital Library author ID |
| P947 | RSL ID (person) |
| P7444 | Rijksmuseum Research Library authority ID |
| P9536 | SAIA authority ID |
| P5485 | SBN books ID |
| P9081 | SEARCH on line catalogue ID |
| P906 | SELIBR ID |
| P3987 | SHARE Catalogue author ID |
| P7609 | SHARE Catalogue work ID |
| P9807 | SNK ID |
| P1025 | SUDOC editions |
| P9322 | SVKKL authority ID |
| P1044 | SWB editions |
| P12198 | Shanghai Library era ID |
| P12226 | Shanghai Library movie ID |
| P12199 | Shanghai Library organization ID |
| P6702 | Shanghai Library person ID |
| P6703 | Shanghai Library place ID |
| P12197 | Shanghai Library surname ID |
| P6329 | Share-VDE 1.0 author ID |
| P8871 | Southwest Harbor Public Library item ID |
| P9164 | Svenska Institutet i Rom ID |
| P7034 | Syriaca work ID |
| P10069 | Tabakalera ID |
| P10844 | Teresianum authority ID |
| P12502 | UCA authority ID |
| P11182 | UOM ID |
| P11944 | USP Libraries Catalogue ID |
| P9147 | Union Catalog of Armenian Continuing Resources ID |
| P8750 | Unione Romana Biblioteche Scientifiche ID |
| P11686 | University of Barcelona authority ID |
| P1580 | University of Barcelona authority ID (former scheme) |
| P8602 | University of Ghana Digital Collections (UGSpace) ID |