U.S.P.R.R. Exp. & Surveys-Cal. & Oregon. Botany-Plate VIII. Abies douglassii
MLA
John Young del, Lith. by A. Hoen & Co., Baltimore, Marylan. U.S.P.R.R. Exp. & Surveys-Cal. & Oregon. Botany-Plate VIII. Abies douglassii. 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/2015736.
APA, 6th edition
John Young del, & Lith. by A. Hoen & Co., Baltimore, Marylan. (["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. Botany-Plate VIII. Abies douglassii]. https://collections.library.yale.edu/catalog/2015736.