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81
82
83
Foot, Sarah | Cambridge University Press | 2003
84
85
86
Safrit, R. Dale | Association for Volunteer Administration | 2002
87
Independent Sector | Association for Volunteer Administration | 2002
88
Hitchcock, H. Wiley | Prentice Hall | 2000
89
Padia, Chandrakala | University of Chicago | 1999
90

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