Gaya APA

Agustin, R., Hastuti, E. (2008). Let's Understand English (Cet.1). Surakarta: Era pustaka utama.

Gaya MLA

Agustin, Reni., Hastuti, Eni. "Let's Understand English". Cet.1 Surakarta: Era pustaka utama, 2008. Text.