Cita APA (7th ed.)

Cunningham F. Gary & Williams, J. W. (2005). Williams obstetrics (22nd ed.). McGraw-Hill.

Cita Chicago (17th ed.)

Cunningham F. Gary i J. Whitridge Williams. Williams Obstetrics. 22nd ed. New York: McGraw-Hill, 2005.

Cita MLA (9th ed.)

Cunningham F. Gary i J. Whitridge Williams. Williams Obstetrics. 22nd ed. McGraw-Hill, 2005.