APA (7th ed.) Citation

Childre, D. L., Martin, H., & Beech, D. (1999). The HeartMath solution. HarperSanFrancisco, a division of HarperCollins Publishers.

Chicago Style (17th ed.) Citation

Childre, Doc Lew, Howard Martin, and Donna Beech. The HeartMath Solution. New York, NY: HarperSanFrancisco, a division of HarperCollins Publishers, 1999.

MLA (9th ed.) Citation

Childre, Doc Lew, et al. The HeartMath Solution. HarperSanFrancisco, a division of HarperCollins Publishers, 1999.