Cita APA (7a ed.)
Thompson, A., & Martinet, A. (1972). Exercises 8. Present and past perfect tenses. Oxford University Press.
Cita Chicago Style (17a ed.)
Thompson, A.J, y A.V Martinet. Exercises 8. Present and Past Perfect Tenses. London: Oxford University Press, 1972.
Cita MLA (9a ed.)
Thompson, A.J, y A.V Martinet. Exercises 8. Present and Past Perfect Tenses. Oxford University Press, 1972.
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