Gaya APA
Yuningsih, Y., Wardani, S.
(2009).
Happy With English
.
Surakarta:
PT Era Pustaka Utama.
Gaya MLA
Yuningsih, Yuyun., Wardani, Susilo.
"Happy With English".
Surakarta:
PT Era Pustaka Utama,
2009.
Art Original.