Cita APA

Ur, P. (2015). Grammar practice activities: A principal guide for teachers (2. ed., 9. reimpr.). New York: Cambridge University Press.

Citación estilo Chicago

Ur, Penny. Grammar Practice Activities: A Principal Guide for Teachers. 2. ed., 9. reimpr. New York: Cambridge University Press, 2015.

Cita MLA

Ur, Penny. Grammar Practice Activities: A Principal Guide for Teachers. 2. ed., 9. reimpr. New York: Cambridge University Press, 2015.