Cite

Map of Puerto Rico showing line of march of General Schwan's expedition from Ponce and Yauco to crossing of Rio Prieto August 9-15, 1898 / Chas. H. Ourand.

MLA

Division, United States. Adjutant-General's Office. Military Information. Map of Puerto Rico Showing Line of March of General Schwan's Expedition from Ponce and Yauco to Crossing of Rio Prieto August 9-15, 1898 / Chas. H. Ourand. Norris Peters Co. Photo-litho, 0AD. https://collections.library.yale.edu/catalog/15832246.

APA, 6th edition

Division, U. S. A.-G. O. M. I. (0 C.E.). Map of Puerto Rico showing line of march of General Schwan's expedition from Ponce and Yauco to crossing of Rio Prieto August 9-15, 1898 / Chas. H. Ourand. [Maps]. Norris Peters Co. Photo-litho, https://collections.library.yale.edu/catalog/15832246.