Gaya APA
Grace, S, &, E. (2006).
Look Ahead 1 An English Course for Senior High School Students Year X .
Jakarta:
Erlangga.
Gaya MLA
Grace, Sudarwati, &, Eudia.
"Look Ahead 1 An English Course for Senior High School Students Year X".
Jakarta:
Erlangga,
2006.
Text.