Ur, P. (2015). Grammar practice activities: A principal guide for teachers (2. ed., 9. reimpr.). New York: Cambridge University Press.
Citación estilo ChicagoUr, Penny. Grammar Practice Activities: A Principal Guide for Teachers. 2. ed., 9. reimpr. New York: Cambridge University Press, 2015.
Cita MLAUr, Penny. Grammar Practice Activities: A Principal Guide for Teachers. 2. ed., 9. reimpr. New York: Cambridge University Press, 2015.
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