Leo, S. (2009). English for Academic Purpose: Essay Writting/ 2009. Yogyakarta: Andi.
Cita Chicago Style (17a ed.)Leo, Sutanto. English for Academic Purpose: Essay Writting/ 2009. Yogyakarta: Andi, 2009.
Cita MLA (8a ed.)Leo, Sutanto. English for Academic Purpose: Essay Writting/ 2009. Yogyakarta: Andi, 2009.
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