Krouwel, B. (1999). Outdoor training: A sourcebook of activities for management trainers. Viva.
Chicago-viite (17. p.)Krouwel, Bill. Outdoor Training: A Sourcebook of Activities for Management Trainers. New delhi: Viva, 1999.
MLA-viite (9. p.)Krouwel, Bill. Outdoor Training: A Sourcebook of Activities for Management Trainers. Viva, 1999.
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