This paper shows method of description of authority data in archive and library community. The principle of provenance as the basic procedure for further understanding the organization of creators of work will be described first. Activity of International Council on Archives (ICA) was shown in the field of development of standards for archival desciption (ISAD(G)), for authority data (ISAAR(CPF)) and functions (ISDF), as well as further activities of ICA in the context of archival description: new conceptual model Records in Context. Activities of IFLA Cataloguing Section was shown in the context of development of guidelines and models for description and exchange of authority data including primarily Guidelines for Authority Records and References (GARR), but the conceptual model for authority dana FRAD was also mentioned. The example of cooperation between international archival and library community in the context of description of authority data, as well as the practices of Croatian archival and library community was shown with emphasis on the development of the Croatian National cataloging code for heritage resources. In the research part of this paper authority data records of persons and corporate bodies in Croatian archival and library catalogs were analized in relation to their adherence to ISAAR(CPF) and GARR elements. The discussion brings comparison of areas and description elements of ISAAR(CPF) and GARR as compared in authority records of ARHiNET and CROLIST union catalogs.