Gaya APA
Kosasih, E., Laelasari, . (2007).
Look A Head I An English Course For senior High School Students year X .
Jakarta:
Erlangga.
Gaya MLA
Kosasih, E.., Laelasari, .
"Look A Head I An English Course For senior High School Students year X".
Jakarta:
Erlangga,
2007.
Text.