Gaya APA

Grace, T, M, S, E. (2006). Look Ahead 1 An English Course : For Senior High School Students Year X . Jakarta: Erlangga.

Gaya MLA

Grace, Th., M., Sudarwati,, Eudia. "Look Ahead 1 An English Course : For Senior High School Students Year X". Jakarta: Erlangga, 2006. Text.