MLA

Johnston, William Walker Whitehall, 1835-1886. Album Page 66. Recto: Group of six officers from the 1st West India Regiment posed standing on the steps of the barracks at Nassau, New Providence; William Walker Whitehall Johnston is third from the left and holds a glass negative holder. Box 1, folder 64. circa 1860. https://collections.library.yale.edu/catalog/15817487.

APA, 6th edition

Johnston, William Walker Whitehall, 1835-1886. (["Box 1, folder 64"])(circa 1860)[Album Page 66. Recto: Group of six officers from the 1st West India Regiment posed standing on the steps of the barracks at Nassau, New Providence; William Walker Whitehall Johnston is third from the left and holds a glass negative holder]. https://collections.library.yale.edu/catalog/15817487.