MLA

Trutch, Joseph W. (Joseph William), Sir, 1826-1904. Preston's sectional and county map of Oregon and Washington : west of the Cascade mountains / compiled ... by J.W. Trutch and G.W. Hyde.. 1856. https://collections.library.yale.edu/catalog/15821569.

APA, 6th edition

Trutch, Joseph W. (Joseph William), Sir, 1826-1904. (1856)[Preston's sectional and county map of Oregon and Washington : west of the Cascade mountains / compiled ... by J.W. Trutch and G.W. Hyde.]. https://collections.library.yale.edu/catalog/15821569.