APA (7th ed.) Citation

Romulo, B. D., & Liley, H. M. I. (1968). The secret world of the baby. Random House.

Chicago Style (17th ed.) Citation

Romulo, Beth Day, and H. M. I. Liley. The Secret World of the Baby. New York: Random House, 1968.

MLA (9th ed.) Citation

Romulo, Beth Day, and H. M. I. Liley. The Secret World of the Baby. Random House, 1968.