SUGGESTED RESOURCE MATERIALS
- Art, P.B. 1970. The Wise Garden Encyclopedia, Harper Collins, New York.
- Bailey, L. H. and E. Z. Bailey. 1976. Hortus third, MacMillan Publishing, New York.
- Dirr, M. A. 1990. Manual of Woody Landscape Plants. 4th ed. Stipes Publishing, Champaign, Ill.
- Huxley, A. 1992. The New Royal Horticulture Society Dictionary of Gardening. Stockton Press, New York.
- Mitchell, P. J. Plant Science Landscape Plant and Herbarium card reference. Oklahoma State University, Cooperative Extension Service, 4-H Leader's Guide.
- Morin, Nancy R. 1993. Flora of North America. Oxford University Press, New York.
- Needham, D. C. 1996. Horticultural Crop Judging. Oklahoma State University, Cooperative Extension Service, 4-H Circ. 702.
- Petrides, G. A. 1992. A Field Guide to Eastern Trees. Houghton Mifflin, Boston, Massachusetts.
- Petrides, G. A. 1992. A Field Guide to Western Trees. Houghton Mifflin, Boston, Massachusetts.
- Pi Alpha Xi 1987. A Manual for Flower Judging. Department of Earth and Plant Science, University of Wisconsin, River Falls.
- Whitcomb, C. E. 1996, Know It and Grow It III. Lacebark Publications, Stillwater, OK.
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