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.
Tema kõige silmapaistvamad teosed olid "Mathematico-Deductive Theory of Rote Learning" (1940) ja "Principles of Behavior" (1943), mis muutsid tema analüüsi loomade õppimiskäitumisest ja klassikalisest tingimisest oma aja dominantseks õppimisteooriaks.