“…Some of the pertinent literature on this problem is by Hartman, Morrison, and Carlson (1963), Ashbaugh (1964), Goldbeck andcampbell (1962), Cartier (1963a), Silberman (1960), Crist (1966), Krumboltz andWeisman (1962), andWilliams (1966). Hidde (1970).…”