Map of the Gadsden Purchase, Sonora, and portions of New Mexico, Chihuaua & California / by Herman Ehrenberg, C.E., from his private notes and those of Colonel Gray, Maj. Heintzelman, Lieut. Parks, and others.
MLA
Ehrenberg, Herman, 1816-1866. Map of the Gadsden Purchase, Sonora, and portions of New Mexico, Chihuaua & California / by Herman Ehrenberg, C.E., from his private notes and those of Colonel Gray, Maj. Heintzelman, Lieut. Parks, and others.. BRBL_00653. 1858. https://collections.library.yale.edu/catalog/15822373.
APA, 6th edition
Ehrenberg, Herman, 1816-1866. (["BRBL_00653"])(1858)[Map of the Gadsden Purchase, Sonora, and portions of New Mexico, Chihuaua & California / by Herman Ehrenberg, C.E., from his private notes and those of Colonel Gray, Maj. Heintzelman, Lieut. Parks, and others.]. https://collections.library.yale.edu/catalog/15822373.