United States. Office of Education. (1918). Vegetable planting calendar, warm season crops; cowpeas. U.S. GPO.
Chicago Style (17th ed.) CitationUnited States. Office of Education. Vegetable Planting Calendar, Warm Season Crops; Cowpeas. Washington: U.S. GPO, 1918.
MLA (9th ed.) CitationUnited States. Office of Education. Vegetable Planting Calendar, Warm Season Crops; Cowpeas. U.S. GPO, 1918.
Warning: These citations may not always be 100% accurate.