Warfield, E. D. (1909). Abraham Lincoln: A memorial address delivered before the American Society for the Extension of University Teaching, in Witherspoon Hall, Philadelphia, February 12, 1909. Philadelphia: [Ketterlinus].

Warfield, Ethelbert Dudley. Abraham Lincoln: A Memorial Address Delivered Before the American Society for the Extension of University Teaching, in Witherspoon Hall, Philadelphia, February 12, 1909. Philadelphia: [Ketterlinus], 1909.

Warfield, Ethelbert Dudley. Abraham Lincoln: A Memorial Address Delivered Before the American Society for the Extension of University Teaching, in Witherspoon Hall, Philadelphia, February 12, 1909. Philadelphia: [Ketterlinus], 1909.