Robert A. Baron ; with the special assistance of Michael J. Kalsher. Robert A. Baron with the special assistance of Michael J. Kalsher Lester W. Milbrath ; with the advice and assistance of Barbara V. Fisher. by John M. Cage, with the assistance of C. J. Bashe. by Ronald E. Scott ; with the editorial assistance of Martin W. Essigmann. by Mary K. Biagini with the assistance of Judith Hartzler.