Gaya APA

Grace, E., Sudarwati, . (2007). Look Ahead Book 3 " An English Course For Senior High School Students Year XII" :Science And Social Study Program . Jakarta: ERLANGGA.

Gaya MLA

Grace, Eudia., Sudarwati, . "Look Ahead Book 3 " An English Course For Senior High School Students Year XII" :Science And Social Study Program". Jakarta: ERLANGGA, 2007. Text.