Gaya APA

Grace, E., Sudarwati, T, M. (). Look Ahead An English Course for Senior High School Students Year XI . Sidoarjo: Erlangga.

Gaya MLA

Grace, Eudia., Sudarwati, Th, M. "Look Ahead An English Course for Senior High School Students Year XI". Sidoarjo: Erlangga, . Text.