Gaya APA

Sudarwati, T, M, &, E, G. (2007). Look Ahead Book 1 : An English Course for Senior High School Students Year X (2007) . Jakarta: Erlangga.

Gaya MLA

Sudarwati, Th., M., &, Eudia, Grace. "Look Ahead Book 1 : An English Course for Senior High School Students Year X (2007)". Jakarta: Erlangga, 2007. Printed Book.