MLA

Adams, George, and photographer. Be Prepared [Graphic]. © 1969 Personality Posters Mfg. Co. Inc., 74 Fifth Avenue, New York, N.Y., 10011, 0AD. https://collections.library.yale.edu/catalog/16049144.

APA, 6th edition

Adams, G., & photographer. (0 C.E.). Be prepared [graphic]. [Photomechanical prints, Posters]. © 1969 Personality Posters Mfg. Co. Inc., 74 Fifth Avenue, New York, N.Y., 10011. https://collections.library.yale.edu/catalog/16049144.