Thomas, B. P., Proctor, R., & Newman, R. G. (1988). Lincoln's New Salem (New and rev. ed.). Southern Illinois University Press.

Thomas, Benjamin Platt, Romain Proctor, and Ralph Geoffrey Newman. Lincoln's New Salem. New and rev. ed. Carbondale: Southern Illinois University Press, 1988.

Thomas, Benjamin Platt, et al. Lincoln's New Salem. New and rev. ed. Southern Illinois University Press, 1988.