Gaya APA
Pulungan, S, E, L. (2007).
Let's Make Friends With English for Elementary School Grade One 1 .
Jakarta:
Esis.
Gaya MLA
Pulungan, Siti, Eryda, Lubis.
"Let's Make Friends With English for Elementary School Grade One 1".
Jakarta:
Esis,
2007.
Text.