¹² See, e.g., Bartol (1973, 1974); Bartol and Butterfield (1976); Bartol and Wortman (1975, 1976); Chapman (1975); Day and Stogdill (1972); Martin (1972); Remland, Jacobson, and Jones (1983); Roussel (1974); and Wexley and Hunt (1974).