Gaya APA

M, S., Grace, E. (2007). Look Ahead An English Course for Senior High School Students Year XI (Science and Social Study Program) (cet. 9). Jakarta: Penerbit Erlangga.

Gaya MLA

M, Sudarwati., Grace, Eudia. "Look Ahead An English Course for Senior High School Students Year XI (Science and Social Study Program)". cet. 9 Jakarta: Penerbit Erlangga, 2007. Text.