Map of Cuba / prepared in the War College Division, General Staff War Department ; drawn by Frank B. Essex & A.B. Williams.
MLA
Essex, Frank B. Map of Cuba / Prepared in the War College Division, General Staff War Department ; Drawn by Frank B. Essex & A.B. Williams. The Division, 1911. https://collections.library.yale.edu/catalog/15821931.
APA, 6th edition
Essex, F. B. (1911). Map of Cuba / prepared in the War College Division, General Staff War Department ; drawn by Frank B. Essex & A.B. Williams. [Maps]. The Division, https://collections.library.yale.edu/catalog/15821931.