MLA

H. B. (Heinrich Baldwin) Mllhausen, T. Sinclair's Lith., Philadelphia, Pennsylvania. U.S.P.R.R. Exp. & Surveys. 35TH Parallel. Itinerary. Fort Smith, Arkansas. Report of explorations for a railway route, near the 35th parallel of north latitudeby Lieutenant A. W. Whipple1853-54. Volume III from Reports of explorations and surveys, to ascertain the most practicable and economical route for a railroad from the Mi. ca. 1855. https://collections.library.yale.edu/catalog/2015545.

APA, 6th edition

H. B. (Heinrich Baldwin) Mllhausen, & T. Sinclair's Lith., Philadelphia, Pennsylvania. (["Report of explorations for a railway route, near the 35th parallel of north latitudeby Lieutenant A. W. Whipple1853-54. Volume III from Reports of explorations and surveys, to ascertain the most practicable and economical route for a railroad from the Mi"])(ca. 1855)[U.S.P.R.R. Exp. & Surveys. 35TH Parallel. Itinerary. Fort Smith, Arkansas]. https://collections.library.yale.edu/catalog/2015545.