(en) William James Beal, History of the Michigan Agricultural College : And Biographical Sketches of Trustees and Professors, Agricultural college, (lire en ligne), p. 414.
(en) Michigan Alumnus, , 652 p. (lire en ligne), p. 311.
(en) « Life devoted to College is concluded: Teacher, scholar, philosopher, combined in qualities of Dr Beal », The M.A.C. Record, vol. 29, no 30, (lire en ligne).