Gaya APA

Sudarwati, M, D, E, G. (2007). Look Ahead an English Course for Senior High Scool Students Year XI (Cet. 1). : Erlangga.

Gaya MLA

Sudarwati, M., Dan, Eudia, Grace. "Look Ahead an English Course for Senior High Scool Students Year XI". Cet. 1 : Erlangga, 2007. .