Downie, M. (1996). Freeform: Student's Book 3. Santillana.
Cita Chicago Style (17a ed.)Downie, Michael. Freeform: Student's Book 3. Buenos Aires: Santillana, 1996.
Cita MLA (9a ed.)Downie, Michael. Freeform: Student's Book 3. Santillana, 1996.
警告：这些引文格式不一定是100％准确.