MLA

Davidson, I. G. (Isaac Grundy), 1845-1922. Oregon and the Pacific Northwest. Volume B. ca. 1879.. https://collections.library.yale.edu/catalog/2018500.

APA, 6th edition

Davidson, I. G. (Isaac Grundy), 1845-1922. (["Volume B"])(ca. 1879.)[Oregon and the Pacific Northwest]. https://collections.library.yale.edu/catalog/2018500.