Gaya APA

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

Gaya MLA

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