1. Dixon, M. R. (2014a). PEAK relational training system: Direct training module. Carbondale, IL: Shawnee Scientific Press.
2. Dixon, M. R. (2014b). PEAK relational training system: Generalization learning module. Carbondale, IL: Shawnee Scientific Press.
3. Dixon, M. R. (in press-a). PEAK relational training system: Equivalence. Carbondale, IL: Shawnee Scientific Press.
4. Dixon, M. R. (in press-b). PEAK relational training system: Transformation. Carbondale, IL: Shawnee Scientific Press.
5. Dixon, M. R., Carman, J., Tyler, P. A., Whiting, S. W., Enoch, M. R., & Daar, J. H. (2014a). PEAK relational training system for children with autism and developmental disabilities: Correlations with peabody picture vocabulary test and assessment reliability. Journal of Developmental and Physical Disabilities, 26(5), 603–614. doi: 10.1007/s10882-014-9384-2 .