Gaya APA
dkk., L, K.
(2007).
Happy Lesson 1 Elementary Student's Book
.
Bandung:
Tinta Emas Publishing.
Gaya MLA
dkk., Lia, Kurniawaty,.
"Happy Lesson 1 Elementary Student's Book".
Bandung:
Tinta Emas Publishing,
2007.
Text.