Foss, L., Green, J., Wolfe-Stiltner, K., & DeLucia, J. (2008). School counselors share their favorite group activities: A guide to choosing, planning, conducting, and processing. Alexandria, VA: Association for Specialists in Group Work.
Explanation::
This resource gives us tips on how to plan a group effectively and how to choose the appropriate number of participants throughout the pre-planning process*