We present Citation Styles, a bibliographic manager app designed to assist students, academics, and researchers worldwide. Developed with the collaboration and supervision of PhD candidates and graduates from the University of Santiago de Compostela, this app aims to simplify the referencing process and promote efficient academic work. Users can automatically obtain and organize data from books, chapters, and articles from scientific journals, or enter them manually. The app offers four reference styles, customizable notes, tagging and filtering options, and easy transfer of references to documents. Our goal is to continuously improve and expand the app to cater to a wide range of academic fields. Some key features include automatic loading of data through ISBN or DOI, free manual input, multiple reference styles, and multilingual support. For more information on the payment application agreement, please visit our website.