1.
Discussions that work. Cambridge, London, New York [etc.]: Cambridge University Press; 1981.
Discussions that work. Cambridge, London, New York [etc.] : Cambridge University Press, 15 juin 1981. ISBN 0-521-28169-5
Ur Penny. (1981). Discussions that work: Task-centred fluency practice. Cambridge University Press.
MLA (8th ed.) CitationUr Penny. Discussions That Work: Task-centred Fluency Practice. Cambridge University Press, 1981.
Warning: These citations may not always be 100% accurate.