Gaya APA

S.Ps, Y, Y., S.Pd, S, W. (2009). Happy with English . Surakarta: PT ERA PUSTAKA UTAMA.

Gaya MLA

S.Ps, YUYUN, YUNINGSIH,., S.Pd, SUSILO, WARDANI,. "Happy with English". Surakarta: PT ERA PUSTAKA UTAMA, 2009. Text.