His most significant works were the Mathematico-Deductive Theory of Rote Learning (1940), and Principles of Behavior (1943), which established his analysis of animal learning and conditioning as the dominant learning theory of its time.
Hans mest betydande verk var Mathematico-Deductive Theory of Rote Learning (1940), samt Principles of Behavior (1943), som etablerat hans analys av djuriskt lärande och anpassning som dominerande inlärningsteori för sin tid.