Cite

Metropolitan map, Portland and vicinity / copyrighted by the H.M. Gousha Company [for] Shell [Oil Company].

MLA

Company, H. M. Gousha. Metropolitan Map, Portland and Vicinity / Copyrighted by the H.M. Gousha Company [for] Shell [Oil Company]. The H.M. Gousha Company, 0AD. https://collections.library.yale.edu/catalog/15821621.

APA, 6th edition

Company, H. M. G. (0 C.E.). Metropolitan map, Portland and vicinity / copyrighted by the H.M. Gousha Company [for] Shell [Oil Company]. [Maps]. The H.M. Gousha Company, https://collections.library.yale.edu/catalog/15821621.