APA (7th ed.) Citation

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

Chicago Style (17th ed.) Citation

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

MLA (9th ed.) Citation

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