Delbercq, A.L., Van de Ven, A.H. and Gustafason, D.H. (1975). Group Techniques for Program Planning (Glenview IL: Scott Foresman)
2.
Kleinknecht, W. (1996). The New Ethnic Mobs: The Changing Face of Organized Crime in America (New York: The Free Press)
3.
Linstone, H.A. (1975). The Delphi Method: Techniques and Applications Metechnique. In H. A. Linstone & M. Turoff (Eds.) The Handbook of Futures Research (Reading MA: Addison Wesley).