Gaya APA

Pd, Y, Y, S., S.Pd, S, W. (2008). Happy With English . Surakarta: Era Pustaka Utama.

Gaya MLA

Pd, Yuyun, Yuningsih,, S.., S.Pd, Susilo, Wardani,. "Happy With English". Surakarta: Era Pustaka Utama, 2008. .