Wickson, E. J. (1921). The california fruits and how to grow them (Ninth edition.). Pacific Rural.
Chicago-referens (17:e uppl.)Wickson, Edward J.. The California Fruits and How to Grow Them. Ninth edition. San Francisco: Pacific Rural, 1921.
MLA-referens (9:e uppl.)Wickson, Edward J.. The California Fruits and How to Grow Them. Ninth edition. Pacific Rural, 1921.
Varning: dessa hänvisningar är inte alltid fullständigt riktiga.