APA (7th ed.) Citation

Williams, J. W., Cunningham, F. G., MacDonald, P. C., & Gant, N. F. (1989). Williams obstetrics (18th ed.). Appleton & Lange.

Chicago Style (17th ed.) Citation

Williams, J. Whitridge, F. Gary Cunningham, Paul C. MacDonald, and Norman F. Gant. Williams Obstetrics. 18th ed. Norwalk, Conn: Appleton & Lange, 1989.

MLA (9th ed.) Citation

Williams, J. Whitridge, et al. Williams Obstetrics. 18th ed. Appleton & Lange, 1989.