MLA

Prudden, T. Mitchell (Theophil Mitchell), 1849-1924. Map of the San Juan Watershed [Southwestern States] : showing the location of prehistoric ruins / compiled by T. Mitchell Prudden.. BRBL_00593. 1903?]. https://collections.library.yale.edu/catalog/15818498.

APA, 6th edition

Prudden, T. Mitchell (Theophil Mitchell), 1849-1924. (["BRBL_00593"])(1903?])[Map of the San Juan Watershed [Southwestern States] : showing the location of prehistoric ruins / compiled by T. Mitchell Prudden.]. https://collections.library.yale.edu/catalog/15818498.