Cite

Photographic postcards from Idlewild, Michigan [graphic].

MLA

Photographic Postcards from Idlewild, Michigan [Graphic]. L.L. Cook Co., 0AD. https://collections.library.yale.edu/catalog/17366430.

APA, 6th edition

Photographic postcards from Idlewild, Michigan [graphic]. (0 C.E.). [Photographic postcards]. L.L. Cook Co. https://collections.library.yale.edu/catalog/17366430.