Ur, P., & Penny Ur. (1988). Grammar practice activities: A practical guide for teachers. Cambridge,New York: Cambridge University Press.
Stile di citazione ChicagoUr, Penny, e Penny Ur. Grammar Practice Activities: A Practical Guide for Teachers. Cambridge,New York: Cambridge University Press, 1988.
Citazione MLAUr, Penny, e Penny Ur. Grammar Practice Activities: A Practical Guide for Teachers. Cambridge,New York: Cambridge University Press, 1988.
Attenzione: Queste citazioni potrebbero non essere precise al 100%.