Citazione Stile APA (7a Edizione)

Norwitz, E. R., & Schorge, J. O. (2013). Obstetrics and gynecology at a glance (4th ed.). John Wiley & Sons, Ltd..

Citazione stile Chigago Style (17a edizione)

Norwitz, Errol R., e John O. Schorge. Obstetrics and Gynecology at a Glance. 4th ed. Chichester, West Sussex, UK: John Wiley & Sons, Ltd., 2013.

Citatione MLA (9a ed.)

Norwitz, Errol R., e John O. Schorge. Obstetrics and Gynecology at a Glance. 4th ed. John Wiley & Sons, Ltd., 2013.