Whitman, E. A. (maj 1943), "Some historical notes on the cycloid", The American Mathematical Monthly, 50 (5): 309-315, doi:10.2307/2302830, JSTOR2302830(abonnement nødvendigt)
jstor.org
Whitman, E. A. (maj 1943), "Some historical notes on the cycloid", The American Mathematical Monthly, 50 (5): 309-315, doi:10.2307/2302830, JSTOR2302830(abonnement nødvendigt)