Military map, island of Puerto Rico, 1898 / drawn by W. Morey Jr. C.E.
MLA
Morey, W. Military Map, Island of Puerto Rico, 1898 / Drawn by W. Morey Jr. C.E. Julius Bien, 1898. https://collections.library.yale.edu/catalog/15821949.
APA, 6th edition
Morey, W. (1898). Military map, island of Puerto Rico, 1898 / drawn by W. Morey Jr. C.E. [Maps]. Julius Bien, https://collections.library.yale.edu/catalog/15821949.