Cita APA (7th ed.)

Sparks, F. W. (1946). Plane trigonometry (Revised ed.). Prentice-Hall.

Cita Chicago (17th ed.)

Sparks, Fred Winchell. Plane Trigonometry. Revised ed. New York: Prentice-Hall, 1946.

Cita MLA (9th ed.)

Sparks, Fred Winchell. Plane Trigonometry. Revised ed. Prentice-Hall, 1946.