Gaya APA

Moore, K, L., Persaud, T, V, N. (2003). Before we are born: essentials of embryology and birth defects (6th ed.). pau: Saunders.

Gaya MLA

Moore, Keith, L.., Persaud, T., V., N.. "Before we are born: essentials of embryology and birth defects". 6th ed. pau: Saunders, 2003. print.