Ur, P. (1989). Grammar practice activities: A practical guide for teachers. Univ. Pr.
Chicago-čujuhus (17. p.)Ur, Penny. Grammar Practice Activities: A Practical Guide for Teachers. Cambridge: Univ. Pr, 1989.
MLA-čujuhus (9. p.)Ur, Penny. Grammar Practice Activities: A Practical Guide for Teachers. Univ. Pr, 1989.
Muitte dárkkistit čujuhemiid riektatvuođa, ovdal go geavahat daid iežat deavsttas.