Here are two highly recommended books on social action, both from the practical point of view. The first is from the Midwest Academy, a Chicago-based social change activist school that since the 1970s has been training organizers for communities, unions, women's groups and other social movements.
Organizing for Social Change: Midwest Academy: Manual for Activists by Kim Bobo, Jackie Kendall and Steve Max.
The Activist's Handbook: A Primer Updated Edition with a New Preface by Randy Shaw