APA (7th ed.) Citation
Smalley, G., Paul, R. S., & Smalley, M. (2007). The DNA of relationships. Tyndale house publishers.
Chicago Style (17th ed.) Citation
Smalley, Gary, Robert S. Paul, and Michael Smalley. The DNA of Relationships. Illinois: Tyndale house publishers, 2007.
MLA (9th ed.) Citation
Smalley, Gary, et al. The DNA of Relationships. Tyndale house publishers, 2007.
Warning: These citations may not always be 100% accurate.