Northup, J., Wacker, D., Sasso, G., Steege, M., Cigrand, K., Cook, J., & DeRaad, A. (1991). A brief functional analysis of aggressive and alternative behavior in an outclinic setting.

Northup, J., D. Wacker, G. Sasso, M. Steege, K. Cigrand, J. Cook, und A. DeRaad. A Brief Functional Analysis of Aggressive and Alternative Behavior in an Outclinic Setting. 1991.

Northup, J., et al. A Brief Functional Analysis of Aggressive and Alternative Behavior in an Outclinic Setting. 1991.