APA (7th ed.) Citation

Williams, J. W., Hellman, L. M., & Pritchard, J. A. (1971). Williams obstetrics. JMC Press.

Chicago Style (17th ed.) Citation

Williams, J. Whitridge, Louis M. Hellman, and Jack A. Pritchard. Williams Obstetrics. Quezon City: JMC Press, 1971.

MLA (9th ed.) Citation

Williams, J. Whitridge, et al. Williams Obstetrics. JMC Press, 1971.