Gaya APA

hestuti,S.S, R, A, P, S, D, E. (2008). Let's understand english . surakarta: PT Era pustaka utama.

Gaya MLA

hestuti,S.S, Reni, Agustin, P,, S.Pd., Dan, Eni. "Let's understand english". surakarta: PT Era pustaka utama, 2008. Text.