William Holding Echols (English Wikipedia)

Analysis of information sources in references of the Wikipedia article "William Holding Echols" in English language version.

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ams.org

Haskell, M. W. (1906). "Review: An Elementary Text-book on the Differential and Integral Calculus by William H. Echols" (PDF). Bull. Amer. Math. Soc. 13 (1): 32–33. doi:10.1090/s0002-9904-1906-01412-4.

archive.org

Bruce, Philip Alexander (1921). History of the University of Virginia, 1819-1919: The Lengthened Shadow of One Man. New York: MacMillan. pp. 257–260.
Echols, William (1902). An Elementary Text-book on the Differential and Integral Calculus. New York: Henry Holt and Company.

doi.org

Haskell, M. W. (1906). "Review: An Elementary Text-book on the Differential and Integral Calculus by William H. Echols" (PDF). Bull. Amer. Math. Soc. 13 (1): 32–33. doi:10.1090/s0002-9904-1906-01412-4.

virginia.edu

math.virginia.edu

"William Holding Echols (1859-1934)". University of Virginia Department of Mathematics, Professors (1825 through 1900). Retrieved 2008-03-20.