Citazione Stile APA (7a Edizione)

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

Citazione stile Chigago Style (17a edizione)

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

Citatione MLA (9a ed.)

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