Gaya APA

Ernawati, F., Sirait, E. (2003). English for Elementary School [4] (Cet. 1.--). Jakarta: Grasindo.

Gaya MLA

Ernawati, Florentina., Sirait, Ellen. "English for Elementary School [4]". Cet. 1.-- Jakarta: Grasindo, 2003. Text.