MLA

Johnston, William Walker Whitehall, 1835-1886. Album Page 68. Recto: Three photographic prints mounted one above another that form a panoramic view of Castries, Saint Lucia. Box 1, folder 66. circa 1860. https://collections.library.yale.edu/catalog/16657612.

APA, 6th edition

Johnston, William Walker Whitehall, 1835-1886. (["Box 1, folder 66"])(circa 1860)[Album Page 68. Recto: Three photographic prints mounted one above another that form a panoramic view of Castries, Saint Lucia]. https://collections.library.yale.edu/catalog/16657612.