Citazione APA

Penny Ur, . .. (1988). Grammar practice activities: A practical guide for teachers. Universities Press.

Stile di citazione Chicago

Penny Ur,. Grammar Practice Activities: A Practical Guide for Teachers. Cambridge: Universities Press, 1988.

Citazione MLA

Penny Ur,. Grammar Practice Activities: A Practical Guide for Teachers. Universities Press, 1988.

Attenzione: Queste citazioni potrebbero non essere precise al 100%.