P. W.  Ball, ?Hills oak (Quercus ellipsoidalis) in southern Ontario, Canada?, Canadian Field-Naturalist, vol. 95, pp. 281-286, 1981.

S. C.  Hokanson, Isebrands, J. G., Jensen, R. J., and Hancock, J. F., ?Isozyme variation in oaks of the Apostle Islands in Wisconsin: Genetic structure and levels of inbreeding in Quercus rubra and Q. ellipsoidalis (Fagaceae)?, American Journal of Botany, vol. 80, pp. 1349-1357, 1993.

W. R.  Overlease, ?Genetic relationships between three species of oaks as determined by common garden studies with populations from Michigan, Indiana and Wisconsin?, Journal of the Pennsylvania Academy of Science, vol. 65, pp. 71-74, 1991.

R. J.  Jensen, Depiero, R., and Smith, B. K., ?Vegetative characters, population variation, and the hybrid origin of Quercus ellipsoidalis?, American Midland Naturalist, vol. 111, pp. 364-370, 1984.

V. - L.  Sork, Stowe, K. - A., and Hochwender, C., ?Evidence for local adaptation in closely adjacent subpopulations of northern Red Oak (Quercus rubra L.) expressed as resistance to leaf herbivores?, American Naturalist, vol. 142, pp. 928-936, 1993.

V. - L.  Sork, Bramble, J., and Sexton, O., ?Ecology of mast-fruiting in three species of North American deciduous oaks?, Ecology, vol. 74, pp. 528-541, 1993.