Moran, S., y R. Garcia. «How Does US College students’ Sense of Life Purpose Relate to Their Emotional Expectations of Being a Volunteer in the Community As Part of a Service-Learning Course?». Bordón. Revista De Pedagogía, vol. 71, n.º 3, noviembre de 2019, pp. 45-62, doi:10.13042/Bordon.2019.70425.