Widder, D. R. (2000). Advanced calculus. Prentice-Hall.
Cita Chicago (17th ed.)Widder, David R. Advanced Calculus. New Delhi: Prentice-Hall, 2000.
Cita MLA (9th ed.)Widder, David R. Advanced Calculus. Prentice-Hall, 2000.
Atenció: Aquestes cites poden no estar 100% correctes.