PowlesW. E.: Movement of Canadian physicians to the U.S.Canada's Mental Health, 17, 2. 1969.
2.
PowlesW. E., GysbertsenJ. B., and RobertsonJ. F.: Migration of Canadian physicians to psychiatry in the United States. Part 1: Dimensions and costs of the net brain drain.Can. Psychiatr. Assoc. J.13, 59. 1972.
3.
WalshR. J., AherneP., and RyanG. A.: Eds.The Profile of Medical Practice, 1972 Reference Data, p. 66Chicago, American Medical Association, Center for Health Services Research and Development.