Gaya APA

S.Pd, R, A., SS, E, H. (2018). Let's Understand English . Surakarta: PT Era Pustaka Utama.

Gaya MLA

S.Pd, Reni, Agustin., SS, Eni, Hestuti. "Let's Understand English". Surakarta: PT Era Pustaka Utama, 2018. Text.