U.S.P.R.R. Exp. & Surveys. 41st Parallel. Expl. by Lieut. Beckwith. Vol.II. Valley of the Mud Lakes Showing Eighty Two Miles of the Projected Rail Road Line. June 14th at 9 A.M. from Mud Lake Peak. 1854 Looking West from C See Map
MLA
C. Schumman from F. W. Egloffstein, Selmar Siebert's Engraving, et al. U.S.P.R.R. Exp. & Surveys. 41st Parallel. Expl. by Lieut. Beckwith. Vol.II. Valley of the Mud Lakes Showing Eighty Two Miles of the Projected Rail Road Line. June 14th at 9 A.M. from Mud Lake Peak. 1854 Looking West from C See Map. 0AD. https://collections.library.yale.edu/catalog/2016608.
APA, 6th edition
C. Schumman from F. W. Egloffstein, S. S. E., Printing Establishment, W., & D. C. (0 C.E.). U.S.P.R.R. Exp. & Surveys. 41st Parallel. Expl. by Lieut. Beckwith. Vol.II. Valley of the Mud Lakes Showing Eighty Two Miles of the Projected Rail Road Line. June 14th at 9 A.M. from Mud Lake Peak. 1854 Looking West from C See Map [Intaglio prints]. https://collections.library.yale.edu/catalog/2016608.