MLA

Steinberg, Saul, 1914-1999. MOMBASA [Streetscape]. Box 78, folder 1621. circa 1977. https://collections.library.yale.edu/catalog/32457576.

APA, 6th edition

Steinberg, Saul, 1914-1999. (["Box 78, folder 1621"])(circa 1977)[MOMBASA [Streetscape]]. https://collections.library.yale.edu/catalog/32457576.