Cita APA (7th ed.)

Rhoad, R., Milauskas, G., & Whipple, R. (1991). Geometry for enjoyment and challenge (New ed.). McDougal, Littell.

Cita Chicago (17th ed.)

Rhoad, Richard, George Milauskas, i Robert Whipple. Geometry for Enjoyment and Challenge. New ed. Evanston, Ill: McDougal, Littell, 1991.

Cita MLA (9th ed.)

Rhoad, Richard, et al. Geometry for Enjoyment and Challenge. New ed. McDougal, Littell, 1991.