Reference:
"Webster-Stratton, C., Reid, M. J., & Hammond, M. (2001). Preventing conduct problems, promoting social competence: A parent and teacher training partnership in Head Start. Journal of clinical child psychology, 30(3), 283-302.
Stattin, H., Enebrink, P., Özdemir, M., & Giannotta, F. (2015). A National Evaluation of Parenting Programs in Sweden: The Short-Term Effects Using an RCT Effectiveness Design. Journal of Consulting and Clinical Psychology.
A revised structure, by Gilmore and Cuskelly (2009), of the Parents’ Sense of Competence measure (PSOC; Johnston & Mash, 1989)"