APA (7th ed.) Citation

Willard, C. E., & Keys, M. (1921). The ABC of life insurance (6th ed.). Spectator Company.

Chicago Style (17th ed.) Citation

Willard, Charles E., and Millard Keys. The ABC of Life Insurance. 6th ed. Chicago [etc.]: Spectator Company, 1921.

MLA (9th ed.) Citation

Willard, Charles E., and Millard Keys. The ABC of Life Insurance. 6th ed. Spectator Company, 1921.