Barkley, E. F. Student Engagement Techniques: A Handbook for College Faculty. San Francisco: Jossey-Bass, 2009.
--Absolutely first rate collection of active learning strategies, described in detail and also illustrated in terms of how they can be used with different kinds of content.
Zepke, N., and Leach, L. “Improving Student Engagement: Ten Proposals for Action.” Active Learning in Higher Education, 2010, 1 (3), 167-177.
--Uses a comprehensive literature review to generate ten concrete actions that can be taken in the classroom and at the institution to improve student engagement.