United States. Department of Agriculture. Office of the Secretary & Yothers, M. A. (1931). Tree hoppers and their control in orchards of Pacific Northwest. U.S. GPO.
Chicago Style (17th ed.) CitationUnited States. Department of Agriculture. Office of the Secretary and M. A. Yothers. Tree Hoppers and Their Control in Orchards of Pacific Northwest. Washington: U.S. GPO, 1931.
MLA (9th ed.) CitationUnited States. Department of Agriculture. Office of the Secretary and M. A. Yothers. Tree Hoppers and Their Control in Orchards of Pacific Northwest. U.S. GPO, 1931.
Warning: These citations may not always be 100% accurate.