Gaya APA

P,S.Pd, R, A., Hestuti,S.s, H. (2008). Let's Understand English . Surakarta: PT Era Pustaka Utama.

Gaya MLA

P,S.Pd, Reni, Agustin., Hestuti,S.s, Heni. "Let's Understand English". Surakarta: PT Era Pustaka Utama, 2008. Text.