Gaya APA

BECKMANN, C, R, B. (2014). OBSTETRICS AND GYNECOLOGY (7). Philadelphia: WOLTERS KLUWER LIPPINCOTT WILLIAMS &WILKINS.

Gaya MLA

BECKMANN, CHARLES, R., B. "OBSTETRICS AND GYNECOLOGY". 7 Philadelphia: WOLTERS KLUWER LIPPINCOTT WILLIAMS &WILKINS, 2014. Text.