Print:
Strand, Levy, David ." Concise Dictionary of Scientific Biography. By Charles Coulston Gillispie. Vol. 19. New York: Charles Scribner's Sons, 1981. 328-332. Print. American Council of Learned Societies.
Online:
http://www.phys-astro.sonoma.edu/brucemedalists/bok/
http://www.nnp.org/nni/Publications/Dutch-American/bokbart.html
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