^The Phi Beta Kappa Key: The Official Publication of the United Chapters of Phi Beta Kappa, Volume 6. Press of the Unionist-gazette Association, 1925. p. 109
^جوشوا لورانس تشامبرلين, Edward Potts Cheyney, Ellis Paxson Oberholtzer (1901) "JOHNSON, Joseph French, 1853-," in: University of Pennsylvania: its history, influence, equipment and characteristics; with biographical sketches and portraits of founders, benefactors, officers and alumni, Vol. 1. p. 427.
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