[2] http://en.wikipedia.org/wiki/Situational_leadership_theory, and Hersey, P. and Blanchard, K. H. (1972). Management of Organizational Behavior: Utilizing Human Resources (2nd ed.) New Jersey/Prentice Hall, Hersey, P. and Blanchard, K. H. (1977). Management of Organizational Behavior: Utilizing Human Resources (3rd ed.) New Jersey/Prentice Hall
[3] J. Goodson et al, "Situational Leadership Theory: A Test of Leadership Prescriptions", Group and Organization Studies, Vol 14, No. 4, p. 358,http://gom.sagepub.com/content/17/3/331.short .