APA (7th ed.) Citation

Gensler, L. E., De Sylva, B., Breen, M. S., & Schwab, L. (1926). Cross your heart. Harms.

Chicago Style (17th ed.) Citation

Gensler, Lewis E., B.G De Sylva, May Singhi Breen, and Laurence Schwab. Cross Your Heart. New York: Harms, 1926.

MLA (9th ed.) Citation

Gensler, Lewis E., et al. Cross Your Heart. Harms, 1926.