(2010). Longman Language Activator (1st, 10th impr.). Longman.
Cita Chicago Style (17a ed.)Longman Language Activator. 1st, 10th impr. Harlow: Longman, 2010.
Cita MLA (9a ed.)Longman Language Activator. 1st, 10th impr. Longman, 2010.
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