Helms, S. E. (2013). Involuntary volunteering: The impact of mandated service in public schools. Economics of education review, 36, 295-310. doi:10.1016/j.econedurev.2013.06.003
Cita Chicago Style (17a ed.)Helms, Sara E. "Involuntary Volunteering: The Impact of Mandated Service in Public Schools." Economics of Education Review 36 (2013): 295-310. https://doi.org/10.1016/j.econedurev.2013.06.003.
Cita MLA (9a ed.)Helms, Sara E. "Involuntary Volunteering: The Impact of Mandated Service in Public Schools." Economics of Education Review, vol. 36, 2013, pp. 295-310, https://doi.org/10.1016/j.econedurev.2013.06.003.
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