Gaya APA

Badrika, I, W. et al (2007). Look A Head 2, An English Cours For Senior High School Students Year XI, Science and Sosial Study Program . Jakarta: Erlangga.

Gaya MLA

Badrika, I, Wayan. et al. "Look A Head 2, An English Cours For Senior High School Students Year XI, Science and Sosial Study Program". Jakarta: Erlangga, 2007. Text.