Treadwell, D., Klassen, W., & Alligood, M. (2008). Annual Cover Crops in Florida Vegetable Systems Part 2: Production. The University of Florida George A. Smathers Libraries.
Chicago-referens (17:e uppl.)Treadwell, Danielle, Waldemar Klassen, och Michael Alligood. Annual Cover Crops in Florida Vegetable Systems Part 2: Production. The University of Florida George A. Smathers Libraries, 2008.
MLA-referens (9:e uppl.)Treadwell, Danielle, et al. Annual Cover Crops in Florida Vegetable Systems Part 2: Production. The University of Florida George A. Smathers Libraries, 2008.
Varning: dessa hänvisningar är inte alltid fullständigt riktiga.