Cita APA (7th ed.)

JOHNSON, M. S. [. a. (1977). Keystone. American Book Co.

Cita Chicago (17th ed.)

JOHNSON, M. Seddon [et al]. Keystone. New York: American Book Co, 1977.

Cita MLA (9th ed.)

JOHNSON, M. Seddon [et al]. Keystone. American Book Co, 1977.