Gaya APA

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

Gaya MLA

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