Dyfyniad APA

 Roach, P. (2009).  English phonetics and phonology: A practical course.  Cambridge University Press.

Dyfyniad Arddull Chicago

 Roach, Peter.  English Phonetics and Phonology: A Practical Course.  Cambridge University Press, 2009.

Dyfyniad MLA

 Roach, Peter.  English Phonetics and Phonology: A Practical Course.  Cambridge University Press, 2009.

Rhybudd: Mae'n bosib nad yw'r dyfyniadau hyn bob amser yn 100% cywir.