Dear researchers and users, in order to complete the standardization process of various issues related to the journal and the system, the method of referring articles to the Chicago system has been changed. It is essential that all articles that are registered and sent in the system since the beginning of June 2023 follow this referencing method. And articles that ignore this important change will be returned. To know the details related to the style sheet file, refer to the "Guide section of Fiqh and Usul" journal for authors.