Gaya APA
Speroff, L., Darney, P, D. (2011).
A Clinical Guide for Contraception fifth edition .
Philadelphia:
Lippincott Williams & Wilkins.
Gaya MLA
Speroff, Leon., Darney, Philip, D..
"A Clinical Guide for Contraception fifth edition".
Philadelphia:
Lippincott Williams & Wilkins,
2011.
Text.