FREUND, J. E. (1964). Modern introduction to mathematics. Prentice-Hall.
Cita Chicago (17th ed.)FREUND, John E. Modern Introduction to Mathematics. Englewood Cliffs: Prentice-Hall, 1964.
Cita MLA (9th ed.)FREUND, John E. Modern Introduction to Mathematics. Prentice-Hall, 1964.
Atenció: Aquestes cites poden no estar 100% correctes.