MLA

Johnston, William Walker Whitehall, 1835-1886. Album Page 73. Verso: Barracks at Fort Charlotte in Nassau, New Providence. Box 1, folder 71. circa 1860. https://collections.library.yale.edu/catalog/14793242.

APA, 6th edition

Johnston, William Walker Whitehall, 1835-1886. (["Box 1, folder 71"])(circa 1860)[Album Page 73. Verso: Barracks at Fort Charlotte in Nassau, New Providence]. https://collections.library.yale.edu/catalog/14793242.