APA (7th ed.) Citation

Elder, M. G., Lamont, R. F., & Romero, R. (1997). Preterm labor. Churchill Livingstone.

Chicago Style (17th ed.) Citation

Elder, Murdo G., Ronald F. Lamont, and Roberto Romero. Preterm Labor. New York: Churchill Livingstone, 1997.

MLA (8th ed.) Citation

Elder, Murdo G., et al. Preterm Labor. Churchill Livingstone, 1997.