Cita APA (7a ed.)

Williams, J. W., & Cunningham, F. G. (1993). Williams obstetrics (19th ed.). Appleton & Lange.

Cita Chicago Style (17a ed.)

Williams, J. Whitridge, y F. Gary Cunningham. Williams Obstetrics. 19th ed. Norwalk: Appleton & Lange, 1993.

Cita MLA (9a ed.)

Williams, J. Whitridge, y F. Gary Cunningham. Williams Obstetrics. 19th ed. Appleton & Lange, 1993.