Gaya APA
Pulungan, S, E, L. (2006).
Lets make Friends with English: for elementary school grade two .
Jakarta:
Erlangga.
Gaya MLA
Pulungan, Siti, Eryda, Lubis.
"Lets make Friends with English: for elementary school grade two".
Jakarta:
Erlangga,
2006.
Text.