R. J.  Jensen, ?A preliminary numerical analysis of the red oak complex in Michigan and Wisconsin USA?, Taxon, vol. 26, pp. 399-407, 1977.

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.

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, Davis, F. - W., Smouse, P. - E., Apsit, V. - J., Dyer, R. - J., Fernandez-M, J. - F., and Kuhn, B., ?Pollen movement in declining populations of California Valley oak, Quercus lobata: Where have all the fathers gone??, Molecular Ecology, vol. 11, pp. 1657-1668, 2002.