@article{Hadfield, author = {Hadfield, J. A.}, title = {Introduction}, series = {J. A. Hadfield (Ed.), Psychology and Modern Problems, New York (Longmans Green and Co.) 1936, pp. 1-25.}, journal = {J. A. Hadfield (Ed.), Psychology and Modern Problems, New York (Longmans Green and Co.) 1936, pp. 1-25.}, language = {en} }