MLA

"Lufterscheinung" Halluzination (Bleistift). 0AD. https://collections.library.yale.edu/catalog/2110228.

APA, 6th edition

"Lufterscheinung" Halluzination (Bleistift). (0 C.E.). [Drawings, Illustrations, Prints (Visual works)]. https://collections.library.yale.edu/catalog/2110228.