1. Beck, A. (1990).The role of animal interaction with children and adolescents: A presentation of studies and practice. Paper presented at the Center for Applied Ethology and Animal/Human Interaction, West Lafayette, Indiana.
2. Beck, A., & Katcher, A.H. (1983).Between pets and people: The importance of animal companionship. New York: G.P. Putnam's Sons.
3. Burmeister, E. (1967).Tough times and tender moments in child care work. New York: Columbia University Press.
4. Epstein, I. (1988). Quantitative and qualitative methods. In R. M. Grinell (Ed.),Social work research and evaluation, 3rd Edition (pp. 185–198). Itasca: F. E. Peacock Publishers.
5. Gonski, Y. (1985). The therapeutic utilization of canines in a child welfare setting.Child & Adolescent Social Work Journal, 2(2), 93–105.