Cita APA

Duncan, J., & Parker, A. (2007). Open forum: Academic listening and speaking : 3. New York, N.Y.: Oxford University Press.

Citación estilo Chicago

Duncan, Janie, y Amy Parker. Open Forum: Academic Listening and Speaking : 3. New York, N.Y.: Oxford University Press, 2007.

Cita MLA

Duncan, Janie, y Amy Parker. Open Forum: Academic Listening and Speaking : 3. New York, N.Y.: Oxford University Press, 2007.