Cita APA (7th ed.)

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

Cita Chicago (17th ed.)

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

Cita MLA (8th ed.)

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