Cabrera, F., Robayo-Castro, B. and Covarrubias, P. 2010. The ‘Huautli’ alternative: Amaranth as reinforcer in operant procedures. Mexican Journal of Behavior Analysis. 36, 2 (Jul. 2010), 71–92. DOI:https://doi.org/10.5514/rmac.v36.i2.18483.