Citazione Stile APA (7a Edizione)

Leveno, K. J. (2007). Williams manual of obstetrics: Pregnancy complications (22nd ed.). McGraw-Hill.

Citazione stile Chigago Style (17a edizione)

Leveno, Kenneth J. Williams Manual of Obstetrics: Pregnancy Complications. 22nd ed. Singapore: McGraw-Hill, 2007.

Citatione MLA (9a ed.)

Leveno, Kenneth J. Williams Manual of Obstetrics: Pregnancy Complications. 22nd ed. McGraw-Hill, 2007.