APA Style

Pulungan, S, E, L. (2007). Let's Make Friends With English 1, for Elementary School Grade One . : Esis, Erlangga.

MLA Style

Pulungan, Siti, Eryda, Lubis. "Let's Make Friends With English 1, for Elementary School Grade One". : Esis, Erlangga, 2007. BOOK.