MLA

Morgan, Nicholas G. (Nicholas Groesbeck), 1884-1971. Pioneer map : Great Salt Lake City, Great Basin, North America / compiled and copyrighted by Nicholas G. Morgan, Sr. ; map work by J.B. Ireland.. BRBL_00592. 1951?]. https://collections.library.yale.edu/catalog/15818486.

APA, 6th edition

Morgan, Nicholas G. (Nicholas Groesbeck), 1884-1971. (["BRBL_00592"])(1951?])[Pioneer map : Great Salt Lake City, Great Basin, North America / compiled and copyrighted by Nicholas G. Morgan, Sr. ; map work by J.B. Ireland.]. https://collections.library.yale.edu/catalog/15818486.