Gaya APA

Grace, E., Sudarwati, . (2006). Look ahead an english course: for senior high school students year X (SMA & MA) . Jakarta: Erlangga.

Gaya MLA

Grace, Eudia., Sudarwati, . "Look ahead an english course: for senior high school students year X (SMA & MA)". Jakarta: Erlangga, 2006. Text.