Gaya APA

S.Pd., Y, Y., S>Pd, S, W. (2008). happy with english . Surakarta: PT Era Pustaka Utama.

Gaya MLA

S.Pd., Yuyun, Yuningsih,., S>Pd, Susilo, Wardani. "happy with english". Surakarta: PT Era Pustaka Utama, 2008. Text.