MLA

Apostolica, Catholic Church. Cancellaria. Regula Quod Ad Instar Non Praeiudicet Familiaribus Descriptis. Revocatio Confessionalium. [Bartholomaeus Guldinbeck?], 0AD. https://collections.library.yale.edu/catalog/17383579.

APA, 6th edition

Apostolica, C. C. C. (0 C.E.). Regula quod ad instar non praeiudicet familiaribus descriptis. Revocatio confessionalium. [Incunabula]. [Bartholomaeus Guldinbeck?]. https://collections.library.yale.edu/catalog/17383579.