Cita APA (7th ed.)

Ur, P. (1981). Discussions that work: Task-centred fluency practice. Cambridge University.

Cita Chicago (17th ed.)

Ur, Penny. Discussions That Work: Task-centred Fluency Practice. Cambridge: Cambridge University, 1981.

Cita MLA (9th ed.)

Ur, Penny. Discussions That Work: Task-centred Fluency Practice. Cambridge University, 1981.