Gaya APA
Pulungan, S, E, L. (2001).
Let's Make Friends with English 1: Book One for Elementary School .
Jakarta:
ESIS.
Gaya MLA
Pulungan, Siti, Eryda, Lubis.
"Let's Make Friends with English 1: Book One for Elementary School".
Jakarta:
ESIS,
2001.
Text.