Cita APA (7th ed.)

Hallerberg, A. E. (1974). Mathematical proof: An elementary approach. Hafner Press.

Cita Chicago (17th ed.)

Hallerberg, Arthur E. Mathematical Proof: An Elementary Approach. New York: Hafner Press, 1974.

Cita MLA (9th ed.)

Hallerberg, Arthur E. Mathematical Proof: An Elementary Approach. Hafner Press, 1974.