Cita APA (7a ed.)
Ur, P. A Course in Language Teaching: Trainee Book. Cambridge University.
Cita estilo Chicago (17a ed.)
Ur, Penny. A Course in Language Teaching: Trainee Book. Cambridge, Inglaterra: Cambridge University.
Cita MLA (9a ed.)
Ur, Penny. A Course in Language Teaching: Trainee Book. Cambridge University.
Precaución: Estas citas no son 100% exactas.