Gaya APA
Soeprapto, F., Darwis, M. (2006).
Linked to the world 2:english for senior high school .
Jakarta:
Yudhistira.
Gaya MLA
Soeprapto, F.A.., Darwis, Mariana.
"Linked to the world 2:english for senior high school".
Jakarta:
Yudhistira,
2006.
Text.