Key points are not available for this paper at this time.
Gregory B. Markus, Jeffrey P. F. Howard, David C. King, Integrating Community Service and Classroom Instruction Enhances Learning: Results from an Experiment, Educational Evaluation and Policy Analysis, Vol. 15, No. 4 (Winter, 1993), pp. 410-419
Markus et al. (Fri,) studied this question.