Gaya APA
Gusnidar, . (1999).
Window On The World: A New Approach To Learning English For SMU Year 1 .
Jakarta:
Penerbit Erlangga.
Gaya MLA
Gusnidar, .
"Window On The World: A New Approach To Learning English For SMU Year 1".
Jakarta:
Penerbit Erlangga,
1999.
Text.