MLA

Mozart, Wolfgang Amadeus, 1756-1791. Entführung aus dem Serail. [178-?]. https://collections.library.yale.edu/catalog/2014098.

APA, 6th edition

Mozart, Wolfgang Amadeus, 1756-1791. ([178-?])[Entführung aus dem Serail]. https://collections.library.yale.edu/catalog/2014098.