Gaya APA

al., R, K, C, E. (2014). Creasy & resnik's maternal-fetal medicine : principles and practice (7). China: Elsevier.

Gaya MLA

al., Robert, K., Creasy,, Et.. "Creasy & resnik's maternal-fetal medicine : principles and practice". 7 China: Elsevier, 2014. Text.