APA (7th ed.) Citation

Cunningham, F. G., Leveno, K. J., & Gant, N. F. Williams Obstetricia (21a ed.).

Chicago Style (17th ed.) Citation

Cunningham, F. Gary, Kenneth J. Leveno, and Norman F. Gant. Williams Obstetricia. 21a ed.

MLA (8th ed.) Citation

Cunningham, F. Gary, et al. Williams Obstetricia. 21a ed.