Cita APA

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

Citación estilo Chicago

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

Cita MLA

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