MLA

[John Young]. U.S.P.R.R. Exp. & Surveys-Cal. & Oregon. General Report-Plate VII. Diamond Peak of ravine of middle fork of Willamette River from Camp 48W. 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/2015695.

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-Plate VII. Diamond Peak of ravine of middle fork of Willamette River from Camp 48W]. https://collections.library.yale.edu/catalog/2015695.