Gaya APA

Hestuti, R, A, P, E. (2008). Let's Understand English . Surakarta: Pt. Era Pustaka Utama.

Gaya MLA

Hestuti, Reni, Agustin, P.,, Eni. "Let's Understand English". Surakarta: Pt. Era Pustaka Utama, 2008. Text.