MLA

Davison, Frederick Trubee, 1896-1974. Maps - Belgium Coast. Box 19, folder 268. 1918. https://collections.library.yale.edu/catalog/10081920.

APA, 6th edition

Davison, Frederick Trubee, 1896-1974. (["Box 19, folder 268"])(1918)[Maps - Belgium Coast]. https://collections.library.yale.edu/catalog/10081920.