Cite

Portland, Oregon : featuring the Columbia River Highway / Portland Chamber of Commerce ; Fred A. Routledge.

MLA

Routledge, Fred A. Portland, Oregon : Featuring the Columbia River Highway / Portland Chamber of Commerce ; Fred A. Routledge. Portland Chamber of Commerce?, 1922. https://collections.library.yale.edu/catalog/15821600.

APA, 6th edition

Routledge, F. A. (1922). Portland, Oregon : featuring the Columbia River Highway / Portland Chamber of Commerce ; Fred A. Routledge. [Aerial views]. Portland Chamber of Commerce?, https://collections.library.yale.edu/catalog/15821600.