The theoretical issue of this work is Eva Verona's Code of Rules for Alphabetical Catalogues with special emphasis upon the rule 96 Pseudonym which deals with various types of relationship between author's real name and its pseudonyms. The purpose of the paper is to research how does the cataloguer choose the uniform name access point, the cross-reference and see also reference in order to help the user to retrieve all the works written under the author's real name or his/her pseudonym. The aim of the paper is to represent the relationship between the real author's name and pseudonym in a few national library catalogues, e.g., The National and University Library in Zagreb (NSK), Bibliotetheque nationale de France (BnF) and Deutsche National Bibliothek (DNB). The work is split into two parts. In the first, theoretical part of our work the emphasis is on the alphabetical catalogues and its aims, author's individual name, the reasons of author's pseudonym, collective pseudonym of two authors and their creative work(s). The second part of the work is a research. The centre of our interest is to retrieve online catalogues: NSK, BnF and DNB where we find out several examples which we described, analysed, compared and commented. The final results of research show that libraries have same practices in some cases, such as choosing uniform name access point and see references, while in several examples of the use of cross-references we found some differences.