The aim of this paper is to present the theoretical starting points of the relational data model and the possibilities of its practical application in bibliographic data. Accordingly, the paper can serve the purpose of further research of the mentioned topic on a theoretical as well as a practical level. In introduction, the paper focuses on the history of access to bibliographic data in the form of their storage and retrieval. Thus, the very beginnings of bibliographic data automation are described, which increasingly achieve their computational usability over time. One of the main milestones in the understanding a presentation of bibliographic data was the MARC format, which defined the universal usability of bibliographic data, which further encouraged the development of online catalogues. Also, one of the milestones in the process of automation of bibliographic data is the FRBR conceptual model, which emphasized the main advantages of the ER data model compared to previous data models such as the hierarchical. Furthermore, the relational model is presented and its characteristics, such as linking entities and inheriting properties are presented using examples of bibliographic data. Also, the paper presents the practical application of SQL language when interacting with relational databases of bibliographic data, thus illustrating the actions of linking relational tables, primarily so that data can be collected and retrieved depending on interest, as well as filtered and sorted based on certain criteria. In this way, the paper presents the basics of working with relational databases, which can contribute to further research of the interaction of bibliographic data structured using this model.