Gaya APA

Joko, P, R, A, P. (2008). Interlanguage: english for senior high school students XI . Surabaya: PT Jepe Press Media Utama.

Gaya MLA

Joko, P,., Riandi,., Anita,, P.M.. "Interlanguage: english for senior high school students XI". Surabaya: PT Jepe Press Media Utama, 2008. Text.