Citazione Stile APA (7a Edizione)

WILLIAMS OBSTETRICS & COX, S. M. [. (2002). Williams obstetrics: Study guide.-- ed.21. McGraw-Hill.

Citazione stile Chigago Style (17a edizione)

WILLIAMS OBSTETRICS e Susan M. [et.al] COX. Williams Obstetrics: Study Guide.-- Ed.21. New York: McGraw-Hill, 2002.

Citatione MLA (9a ed.)

WILLIAMS OBSTETRICS e Susan M. [et.al] COX. Williams Obstetrics: Study Guide.-- Ed.21. McGraw-Hill, 2002.