APA Citation

Berkley, S. (2009). Speak to influence: How to unlock the hidden power of your voice. Kuala Lumpur: Ar-Risalah Product.

Chicago Style Citation

Berkley, Susan. Speak to Influence: How to Unlock the Hidden Power of Your Voice. Kuala Lumpur: Ar-Risalah Product, 2009.

MLA Citation

Berkley, Susan. Speak to Influence: How to Unlock the Hidden Power of Your Voice. Kuala Lumpur: Ar-Risalah Product, 2009.

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