APA Style

Thachir, A., Pulungan, S, E, L. (2007). Let's Make Friends With English: For Elementary School Grade One . Jakarta: Erlangga.

MLA Style

Thachir, A.Malik., Pulungan, Siti, Eryda, Lubis. "Let's Make Friends With English: For Elementary School Grade One". Jakarta: Erlangga, 2007. Text.