Gusnidar. (2003). WINDOW ON THE WORLD A New Approach to Learning English for SMU year 1 Semester System. Erlangga.
Čikaški stil citiranja (17. izdanje)Gusnidar. WINDOW ON THE WORLD A New Approach to Learning English for SMU Year 1 Semester System. Erlangga, 2003.
MLA način citiranja (8. izdanje)Gusnidar. WINDOW ON THE WORLD A New Approach to Learning English for SMU Year 1 Semester System. Erlangga, 2003.
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