Krouwel, B. (1999). Outdoor training: A sourcebook of activities for management trainers. Viva.
Lua i Stíl Chicago (17ú heag.)Krouwel, Bill. Outdoor Training: A Sourcebook of Activities for Management Trainers. New delhi: Viva, 1999.
Lua MLA (9ú heag.)Krouwel, Bill. Outdoor Training: A Sourcebook of Activities for Management Trainers. Viva, 1999.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.