MLA

Insel-Woche. [Insel Druckerei], 1915. https://collections.library.yale.edu/catalog/11870151.

APA, 6th edition

Insel-Woche. (1915). [Covers (Illustrations), Hand coloring, Magazines (periodicals), Manuscript]. [Insel Druckerei], https://collections.library.yale.edu/catalog/11870151.