APA (7e ed.) Bronvermelding

Cunningham F. Gary & Williams, J. W. (2001). Williams obstetrics (21st ed.). McGraw-Hill.

Chicago (17e ed.) Bronvermelding

Cunningham F. Gary en J. Whitridge Williams. Williams Obstetrics. 21st ed. New York: McGraw-Hill, 2001.

MLA (9e ed.) Bronvermelding

Cunningham F. Gary en J. Whitridge Williams. Williams Obstetrics. 21st ed. McGraw-Hill, 2001.