Gaya APA

Saraswati, R., Rustama, M, M, L, &, S. (2017). PETER (Cetakan 4). Jakarta: McGraw hILL Higher Education.

Gaya MLA

Saraswati, Risa., Rustama, Maria, M., Lubis, &, Syafial. "PETER". Cetakan 4 Jakarta: McGraw hILL Higher Education, 2017. Text.