Handbook of Energy Crops—James A. Duke. 1983. unpublished.
New Horticultural Crops in New Zealand—Errol W. Hewett
Exploration and Exploitation of New Fruit and Nut Germplasm—Maxine M. Thompson
Magness, J.R., G.M. Markle, C.C. Compton. 1971. Food and feed crops of the United States.
PRI disease resistant apple breeding program an apple breeding cooperative of Purdue University, Rutgers, and the University of Illinois.
Apples, Malus domestica from Mark Reiger, Horticulture Dept., University of Georgia.
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