Citazione Stile APA (7a Edizione)

Cunningham F. Gary & Williams, J. W. (2010). Williams obstetrics (23rd ed.). McGraw-Hill Medical.

Citazione stile Chigago Style (17a edizione)

Cunningham F. Gary e J. Whitridge Williams. Williams Obstetrics. 23rd ed. New York: McGraw-Hill Medical, 2010.

Citatione MLA (9a ed.)

Cunningham F. Gary e J. Whitridge Williams. Williams Obstetrics. 23rd ed. McGraw-Hill Medical, 2010.