Gaya APA

Sudarwati, M., Grace, E. (2009). Look Ahead An English Course for Senior High School Students Year XII Science And Social Study Program . JAKARTA: Erlangga.

Gaya MLA

Sudarwati, M.., Grace, Eudia. "Look Ahead An English Course for Senior High School Students Year XII Science And Social Study Program". JAKARTA: Erlangga, 2009. Text.