Freeman, J. F. (2008). High Plains horticulture: A history. University Press of Colorado.
Chicago-čujuhus (17. p.)Freeman, John F. High Plains Horticulture: A History. Boulder: University Press of Colorado, 2008.
MLA-čujuhus (9. p.)Freeman, John F. High Plains Horticulture: A History. University Press of Colorado, 2008.
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