1. Anheier, H. K., & Salamon, L. M. (1999). Volunteering in cross-national perspective: initial comparisons. Law and Contemporary Problems,
62(4), 43–65.
2. Bardin, L. (1977). L`analyse de contenu. Paris: Quadrige, Presses Universitaires de France.
3. Barker, D. G. (1993). Values and volunteering. Volunteering in Europe,
12, 23–24.
4. Christensen, C. M., Grossman, J. H., & Hwang, J. (2009). Inovação na gestão da saúde: a receita para reduzir custos e aumentar a qualidade. Porto Alegre: Bookman.
5. Cravens, J. (2006). Involving international online volunteers: Factors for success, organizational benefits, and new views of community. The International Journal of Volunteer Administration,
24(1), 15–23.