Gaya APA
Tresnadewi, S.
(2002).
Happy wigh English 1 : English Textbook for Elementary School
.
Jakarta:
Ganeca Exact.
Gaya MLA
Tresnadewi, Sintha.
"Happy wigh English 1 : English Textbook for Elementary School".
Jakarta:
Ganeca Exact,
2002.
Text.