Gaya APA

Sugeng, B., Aji, P. (2001). Let's Make Friends with English [4] : Book Four for Elementary School (--). Jakarta: Esis.

Gaya MLA

Sugeng, Bambang., Aji, Paulan. "Let's Make Friends with English [4] : Book Four for Elementary School". -- Jakarta: Esis, 2001. Text.