Moreno, D., Cepeda, M. L., Hickman, H., Peñalosa, E., & Ribes, E. (2011). Differential effect relational descriptive verbal behavior in the acquisition and transfer of a second-order conditional discrimination in children. Mexican Journal of Behavior Analysis, 17(1-2), 81–99. https://doi.org/10.5514/rmac.v17.i1-2.23291