U.S.P.R.R. Exp. & Surveys-Cal. & Oregon. General Report-Plate VI. Three Sisters, and canon of McKenzies Fork of Willamette River, from Camp P
MLA
[John Young]. U.S.P.R.R. Exp. & Surveys-Cal. & Oregon. General Report-Plate VI. Three Sisters, and canon of McKenzies Fork of Willamette River, from Camp P. 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/2015694.
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 VI. Three Sisters, and canon of McKenzies Fork of Willamette River, from Camp P]. https://collections.library.yale.edu/catalog/2015694.