Cita APA (7th ed.)
Freeman, J. F. (2008). High Plains horticulture: A history. University Press of Colorado.
Cita Chicago (17th ed.)
Freeman, John F. High Plains Horticulture: A History. Boulder: University Press of Colorado, 2008.
Cita MLA (9th ed.)
Freeman, John F. High Plains Horticulture: A History. University Press of Colorado, 2008.
Atenció: Aquestes cites poden no estar 100% correctes.