1. Research on K-12 school-based service-learning: The evidence builds;Billig;Phi Delta Kappan,2000
2. Research agenda for K-12 service-learning: A proposal to the field;Billig,2002
3. Qualitative research in education: An introduction to theory and methods;Bogdan,1998
4. Implementing service learning in higher education;Bringle;Journal of Higher Education,1996
5. Situated cognition and the culture of learning;Brown;Educational Researcher,1989