APA (7e ed.) Bronvermelding

Cunningham, F. G., Macdonald, P. C., & Gant, N. F. Williams: Obstetricia (4a ed.).

Chicago (17e ed.) Bronvermelding

Cunningham, F. Gary, Paul C. Macdonald, en Norman F. Gant. Williams: Obstetricia. 4a ed.

MLA (8e ed.) Bronvermelding

Cunningham, F. Gary, et al. Williams: Obstetricia. 4a ed.