United States. Bureau of Plant Industry. (1942). Investigations on cause and control of biennial bearing of apple trees. [s.n.].
Chicago Style (17th ed.) CitationUnited States. Bureau of Plant Industry. Investigations on Cause and Control of Biennial Bearing of Apple Trees. [Washington]: [s.n.], 1942.
MLA (9th ed.) CitationUnited States. Bureau of Plant Industry. Investigations on Cause and Control of Biennial Bearing of Apple Trees. [s.n.], 1942.
Warning: These citations may not always be 100% accurate.