Roethlisberger, F.J., "Learning in a Multidimensional World," in Γ. J. Roethlisberger ct al, Training for Human, Relations . Boston: Harvard Graduate School of Business Administration, Harvard University. 1954, 115-142.
2.
Watson, G. , "What Do We Know about Learning?," NEA journal, March, 1963, 20-22.