APA (7th ed.) Citation

Preller, J., Speirs, J., & Alley, R. W. (1999). The case of the secret Valentine. Scholastic.

Chicago Style (17th ed.) Citation

Preller, James, John Speirs, and R. W. Alley. The Case of the Secret Valentine. New York: Scholastic, 1999.

MLA (8th ed.) Citation

Preller, James, et al. The Case of the Secret Valentine. Scholastic, 1999.

Warning: These citations may not always be 100% accurate.