APA (7th ed.) Citation

Cunningham, F. G., Gant, N. F., & MacDonald, P. C. Williams Obstetricia (20a ed.).

Chicago Style (17th ed.) Citation

Cunningham, F. Gary, Norman F. Gant, and Paul C. MacDonald. Williams Obstetricia. 20a ed.

MLA (8th ed.) Citation

Cunningham, F. Gary, et al. Williams Obstetricia. 20a ed.