Gaya APA

Sudarwati, T, M., Grace, E. (). Look Ahead 1: An English Course for Senior High School Year X (Pertama). Jakarta: ERLANGGA.

Gaya MLA

Sudarwati, Th., M.., Grace, Eudia. "Look Ahead 1: An English Course for Senior High School Year X". Pertama Jakarta: ERLANGGA, . Text.