Downie, M. (1998). Freeform: Student's book 1A. Santillana.
Cita Chicago Style (17a ed.)Downie, Michael. Freeform: Student's Book 1A. Buenos Aires: Santillana, 1998.
Cita MLA (9a ed.)Downie, Michael. Freeform: Student's Book 1A. Santillana, 1998.
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