MLA

Johnston, William Walker Whitehall, 1835-1886. Album Page 23. Recto: Sailing ships from the beach at the Mumbles near Swansea, Wales. Box 1, folder 21. 1858. https://collections.library.yale.edu/catalog/10944320.

APA, 6th edition

Johnston, William Walker Whitehall, 1835-1886. (["Box 1, folder 21"])(1858)[Album Page 23. Recto: Sailing ships from the beach at the Mumbles near Swansea, Wales]. https://collections.library.yale.edu/catalog/10944320.