Peter Ackerman and Jack DuVall, A Force More Powerful: A Century of Nonviolent Conflict (2000). Companion book to PBS series of the same title.
Peter Ackerman and Christopher Kruegler, Strategic Nonviolent Conflict: The Dynamics of People Power in the Twentieth Century (1994). Excellent discussion of the strategic use of nonviolent action.
David Albert, People Power: Applying Nonviolent Theory (1985). Useful general introduction to nonviolent action.
Joan Bondurant, Conquest of Violence (revised ed. 1965). Gandhian nonviolence.
Robert Cooney and Helen Michalowski, The Power of the People: Active Nonviolence in the United States (1977). Inspiring political history with fine text.
Dave Dellinger, Revolutionary Nonviolence (1970). Outstanding political essays.
Barbara Deming, We Are All Part of One Another: A Barbara Deming Reader (1984). The most important feminist theoretician of nonviolence.
Susanne Gowan, et al., Moving Toward a New Society (1976). Analysis, vision, and strategy for a nonviolent revolutionary movement.
Robert A. Irwin, Building a Peace System (1989). Exploration of the requirements and attributes of an international peace system.
George Lakey, Strategy for a Living Revolution (revised ed. 1985). Nonviolent strategic approach.
Pam McAllister, ed., Reweaving the Web of Life: Feminism and Nonviolence (1982).
Gene Sharp, Social Power and Political Freedom (1980). Essays in nonviolence theory.
Gene Sharp, The Politics of Nonviolent Action (1973). Indispensable three-volume reference.