W. R.  Overlease, ?A study of the relationship between Scarlet Oak (Quercus coccinea Muenchh.) and Hill Oak (Quercus ellipsoidalis E.J. Hill) in Michigan and nearby states?, Journal of the Pennsylvania Academy of Science, vol. 51, pp. 47-50, 1977.

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.