Gaya APA

HASTUTI, R, A, P, &, E. (2009). LET'S UNDERSTAND ENGLISH . Surakarta: PT Era Pustaka Utama.

Gaya MLA

HASTUTI, RENI, AGUSTIN, P, &, ENI. "LET'S UNDERSTAND ENGLISH". Surakarta: PT Era Pustaka Utama, 2009. Text.