U.S. Geological Survey. Brontotheridae
MLA
Marsh, Othniel Charles. U.s. Geological Survey: Brontotheridae. [New Haven?, [8980?]
APA, 7th edition
Marsh, O. Charles. ([8980?]). U.S. Geological Survey: Brontotheridae. [New Haven?
Chicago, 17th edition
Marsh, Othniel Charles. U.S. Geological Survey: Brontotheridae. [New Haven?, [8980?]