APA Style
Leveno, K, J. et al (2002).
Williams Manual of Obstetrics (21 st Edition).
United States:
The Mc-Graw Hill Companies.
MLA Style
Leveno, Kenneth, J. et al.
"Williams Manual of Obstetrics".
21 st Edition
United States:
The Mc-Graw Hill Companies,
2002.
Text.