Freeman, J. F. (2008). High Plains horticulture: A history. University Press of Colorado.
芝加哥风格引文Freeman, John F. High Plains Horticulture: A History. Boulder: University Press of Colorado, 2008.
MLA引文Freeman, John F. High Plains Horticulture: A History. University Press of Colorado, 2008.
警告：这些引文格式不一定是100％准确.