Gaya APA
..., M, ., [, E, ]. et al (2007).
English on sky 3 for junior high school students year ix (Cet. 1).
Jakarta:
Erlangga.
Gaya MLA
..., Mukarto, ..., [, Et.al, ]. et al.
"English on sky 3 for junior high school students year ix".
Cet. 1
Jakarta:
Erlangga,
2007.
Text.