MLA

Ernest Augustus, King of Hanover, 1771-1851. Wiener-Tagsbelustigung, Pot-Pourri für das Pianoforte.... Print (Vienna: Tobias Haslinger). Box 137, folder 721. 1830. https://collections.library.yale.edu/catalog/10000213.

APA, 6th edition

Ernest Augustus, King of Hanover, 1771-1851. (["Box 137, folder 721"])(1830)[Wiener-Tagsbelustigung, Pot-Pourri für das Pianoforte.... Print (Vienna: Tobias Haslinger)]. https://collections.library.yale.edu/catalog/10000213.