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169 Shields, Peggy O. (2009): Young Adult Volunteers. Recruitment Appeals and Other Marketing Considerations. In: Journal of Nonprofit & Public Sector Marketing 21, 2, S. 139-159. Sundeen, Richard A. (1992): Differences in Personal Goals and Attitudes Among Volunteers. In: Nonprofit and Voluntary Sector Quarterly 21, 3, S. 271-291. Sundeen, Richard A./Raskoff, Sally A. (2000): Ports of Entry and Obstacles. Teenagers’Access to Volunteer Activities. In: Nonprofit Management and Leadership 11, 2, S. 179-197. Vázquez, José-Luis et al. (2015): Expressive and instrumental motivations ex- plaining youth participation in non-profit voluntary associations. An ap- plication in Spain. In: International Review on Public and Nonprofit Mar- keting 12, 3, S. 237-251.