Hayes, D. (1998). Effective verbal communication. London: Hodder and Stoughton.
Dyfyniad Arddull ChicagoHayes, Denis. Effective Verbal Communication. London: Hodder and Stoughton, 1998.
Dyfyniad MLAHayes, Denis. Effective Verbal Communication. London: Hodder and Stoughton, 1998.
Rhybudd: Mae'n bosib nad yw'r dyfyniadau hyn bob amser yn 100% cywir.