Skinner, B. F. (2011). The causes of Behavior. (Ed. & Trad.), About Behaviorism. (pp.10-37). Recuperado de: https://books.google.es/books?hl=es&lr=&id=K7WKkwPzNqsC&oi=fnd&pg=PA3&dq=reasons+why+a+person+emits+behaviors+when+consuming+food&ots=3f4Ml6Fnyk&sig=w7Or696AOlFTHfpkvAsxe3RvwQc#v=onepage&q&f=false.(Trabajo original publicado en 1957).