Gaya APA
Santoso, D, E.
(1999).
Let's Learn English Learn Whhile You Smile
.
Jakarta:
Pustaka Tangga.
Gaya MLA
Santoso, Dra., Eunice.
"Let's Learn English Learn Whhile You Smile".
Jakarta:
Pustaka Tangga,
1999.
Bahasa.