APA Citation

Berkley, S. Speak to influence: How to unlock the hidden power of your voice. Batu Caves: Ar-Risalah Product Sdn. Bhd.lc1999.

Chicago Style Citation

Berkley, Susan. Speak to Influence: How to Unlock the Hidden Power of Your Voice. Batu Caves: Ar-Risalah Product Sdn. Bhd.lc1999.

MLA Citation

Berkley, Susan. Speak to Influence: How to Unlock the Hidden Power of Your Voice. Batu Caves: Ar-Risalah Product Sdn. Bhd.lc1999.

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