Cita APA (7a ed.)
Ur, P. (2001). Grammar Practice Activities: A Practical Guide for Teachers. Cambridge University.
Cita estilo Chicago (17a ed.)
Ur, Penny. Grammar Practice Activities: A Practical Guide for Teachers. Cambridge, Inglaterra: Cambridge University, 2001.
Cita MLA (9a ed.)
Ur, Penny. Grammar Practice Activities: A Practical Guide for Teachers. Cambridge University, 2001.
Precaución: Estas citas no son 100% exactas.