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jstor.org
Henderson, James B.; Godfrey, C. (1924), "The Stroud system of teaching dynamics", The Mathematical Gazette, 12 (170): 99–105, doi:10.2307/3604647, JSTOR3604647, S2CID125929042.
Henderson, James B.; Godfrey, C. (1924), "The Stroud system of teaching dynamics", The Mathematical Gazette, 12 (170): 99–105, doi:10.2307/3604647, JSTOR3604647, S2CID125929042.