Cita APA (7th ed.)

Kenna, L. A. (1962). Understanding mathematics with visual aids. Littlefield, Adams and Co.

Cita Chicago (17th ed.)

Kenna, L. A. Understanding Mathematics with Visual Aids. New Jersey: Littlefield, Adams and Co, 1962.

Cita MLA (9th ed.)

Kenna, L. A. Understanding Mathematics with Visual Aids. Littlefield, Adams and Co, 1962.