APA (7th ed.) Citation
Sundel, S. S., & Sundel, M. (1980). Be assertive: A practical guide for human service workers. Sage Publications.
Chicago Style (17th ed.) Citation
Sundel, Sandra Stone, and Martin Sundel. Be Assertive: A Practical Guide for Human Service Workers. Beverly Hills: Sage Publications, 1980.
MLA (9th ed.) Citation
Sundel, Sandra Stone, and Martin Sundel. Be Assertive: A Practical Guide for Human Service Workers. Sage Publications, 1980.
Warning: These citations may not always be 100% accurate.