Gaya APA
Sudarwati, ., Grace, E. (2007).
Look Ahead An English Course for Senior High School Students Year XI .
Jakarta:
Erlangga.
Gaya MLA
Sudarwati, ., Grace, Eudia.
"Look Ahead An English Course for Senior High School Students Year XI".
Jakarta:
Erlangga,
2007.
Text.