MLA

Simpson, Randolph Linsly, 1927-1992. Alabama Postcard Co., Bessemer, AL "Dr. A.G. Gaston:" businessman stands behind desk, cigar in hand, right hand on globe. Postcard in color. Box 25, folder 1036. circa 1970. https://collections.library.yale.edu/catalog/32312560.

APA, 6th edition

Simpson, Randolph Linsly, 1927-1992. (["Box 25, folder 1036"])(circa 1970)[Alabama Postcard Co., Bessemer, AL "Dr. A.G. Gaston:" businessman stands behind desk, cigar in hand, right hand on globe. Postcard in color]. https://collections.library.yale.edu/catalog/32312560.