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.