Cita APA (7th ed.)

Welchons, A. (1962). Modern trigonometry. Ginn.

Cita Chicago (17th ed.)

Welchons, A.M. Modern Trigonometry. Boston: Ginn, 1962.

Cita MLA (9th ed.)

Welchons, A.M. Modern Trigonometry. Ginn, 1962.