Cita APA (7th ed.)

Morrison, M. (2009). Clear Speech: Practical Speech Correction and Voice Improvement. A & C Black Publishers Ltd.

Cita Chicago (17th ed.)

Morrison, Malcolm. Clear Speech: Practical Speech Correction and Voice Improvement. A & C Black Publishers Ltd, 2009.

Cita MLA (9th ed.)

Morrison, Malcolm. Clear Speech: Practical Speech Correction and Voice Improvement. A & C Black Publishers Ltd, 2009.