APA Citation

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

Chicago Style Citation

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

MLA Citation

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

Warning: These citations may not always be 100% accurate.