Gaya APA

Pulungan, D, S, E, L. et al (2001). Let's Make Friends with English : Book Two for Elementary School . Jakarta: Esis.

Gaya MLA

Pulungan, Dr., Siti, Eryda, Lubis. et al. "Let's Make Friends with English : Book Two for Elementary School". Jakarta: Esis, 2001. Text.