United States. Bureau of Entomology and Plant Quarantine. (1944). Cabbage looper as pest of lettuce in the Southwest. [s.n.].
Chicago Style (17th ed.) CitationUnited States. Bureau of Entomology and Plant Quarantine. Cabbage Looper as Pest of Lettuce in the Southwest. [Washington]: [s.n.], 1944.
MLA (9th ed.) CitationUnited States. Bureau of Entomology and Plant Quarantine. Cabbage Looper as Pest of Lettuce in the Southwest. [s.n.], 1944.
Warning: These citations may not always be 100% accurate.