The SDS is a direct product of a theory of personality types and environmental models developed by John Holland.
American Psychologist staff (2008). Award for distinguished scientific applications of psychology: John L. Holland. American Psychologist, 63, 672-674.
Gottfredson, G. D. (1999). John L. Holland’s contributions to vocational psychology: A review and evaluation. Journal of Vocational Behavior, 55, 15-40.