Williamson, B. (1955). An elementary treatise on the Integral Calculus. Scientific Book Co.
Lua i Stíl Chicago (17ú heag.)Williamson, Benjamin. An Elementary Treatise on the Integral Calculus. Patna: Scientific Book Co, 1955.
Lua MLA (9ú heag.)Williamson, Benjamin. An Elementary Treatise on the Integral Calculus. Scientific Book Co, 1955.
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