Widder, D. R. (2000). Advanced calculus. Prentice-Hall.
Tohutoru Kātū Chicago (17th ed.)Widder, David R. Advanced Calculus. New Delhi: Prentice-Hall, 2000.
Tohutoro MLA (9th ed.)Widder, David R. Advanced Calculus. Prentice-Hall, 2000.
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