Fischer, U. C., Jung, C., Bergo, C., Godart, A., Michaelis, T., Nägele, D., Passa, A., Ries, J., Ruud, L., Salovaara, A., & Werding, R. (2004). Motivation and qualification of volunteers. A manual for working with volunteers in drug addiction prevention. Landau: Verlag Empirische Pädagogik.

ISBN: 3-937333-16-9, 288 pages

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