MLA

[John Young]. U.S.P.R.R. Exp. & Surveys-Cal.. & Oregon. General report-PlateIV. Mount Pitt, Klamath River & Upper Klamath Lake from Camp 30. Report of Lieut. Henry L. Abbotupon explorations for a railroad route, from the Sacramento Valley to the Columbia River, made by Lieut R. S. Williamson1855. Volume VI from Reports of explorations and surveys, to ascertain the most practicable and economi. ca. 1855. https://collections.library.yale.edu/catalog/2015688.

APA, 6th edition

[John Young]. (["Report of Lieut. Henry L. Abbotupon explorations for a railroad route, from the Sacramento Valley to the Columbia River, made by Lieut R. S. Williamson1855. Volume VI from Reports of explorations and surveys, to ascertain the most practicable and economi"])(ca. 1855)[U.S.P.R.R. Exp. & Surveys-Cal.. & Oregon. General report-PlateIV. Mount Pitt, Klamath River & Upper Klamath Lake from Camp 30]. https://collections.library.yale.edu/catalog/2015688.