Cita APA (7a ed.)

Ur, P. Discussions that work: Task-centred fluency practice (1a ed., 8a reimpresión.).

Cita Chicago Style (17a ed.)

Ur, Penny. Discussions That Work: Task-centred Fluency Practice. 1a ed., 8a reimpresión.

Cita MLA (8a ed.)

Ur, Penny. Discussions That Work: Task-centred Fluency Practice. 1a ed., 8a reimpresión.