Beebe 1918, p. 3 quoted in Welker 1975, pp. 36–37 Beebe, William (1918), Jungle Peace, New York: Henry Holt and Company, ASINB00086QMYO Welker, Robert Henry (1975), Natural Man: The Life of William Beebe, Bloomington, Indiana: Indiana University Press, ISBN978-0-253-33975-1
Beebe 1918, p. 3 quoted in Welker 1975, pp. 36–37 Beebe, William (1918), Jungle Peace, New York: Henry Holt and Company, ASINB00086QMYO Welker, Robert Henry (1975), Natural Man: The Life of William Beebe, Bloomington, Indiana: Indiana University Press, ISBN978-0-253-33975-1
"The Arcturus Oceanographic Expedition". (New York) Zoological Society Bulletin. 28 (4). New York: New York Zoological Society: 79–86. July 1925. Retrieved July 7, 2019.