United States. Department of Agriculture. Office of the Secretary, Graves, H. S., & Nelson, E. W. (1919). Our national elk herds; program for conserving elk on national forests about Yellowstone National Park. U.S. GPO.
Chicago Style (17th ed.) CitationUnited States. Department of Agriculture. Office of the Secretary, Henry Solon Graves, and Edward William Nelson. Our National Elk Herds; Program for Conserving Elk on National Forests About Yellowstone National Park. Washington: U.S. GPO, 1919.
MLA (9th ed.) CitationUnited States. Department of Agriculture. Office of the Secretary, et al. Our National Elk Herds; Program for Conserving Elk on National Forests About Yellowstone National Park. U.S. GPO, 1919.
Warning: These citations may not always be 100% accurate.