FurstW. (1992). Die Erlebnisgruppe [The adventure group]. Freiburg: Lambertus.
4.
GassM. (1991). Enhancing metaphor development in adventure therapy programs. Journal of Experiential Education, 14(2), 6–13.
5.
GassM. (Ed.) (1993). Adventure therapy. Boulder, CO: Association for Experiential Education.
6.
GassM. (Ed.) (1995). Book of metaphors, Vol II. Dubuque, IA: Kendall/Hunt.
7.
GilsdorfR. (1993). Erlebnisp%dagogik auf dem Weg zurck in die Schule [Adventure education on its way back into school]. In HomfeldtH.G. (Ed.), Erlebnispadagogik. Baltmannsweiler: Schneider.
GudjonsH. (1992). Handlungsorientiert lehren und lernen [Experiential teaching and learning]. Bad Heilbrunn: Klinkhardt.
10.
HammelH. (1986). How to design a debriefing session. Journal of Experiential Education, 9(3), 20–25
11.
KimballR.BaconS. (1993). The wilderness challenge model. In GassM. (Ed.), Adventure therapy. Boulder, CO: Association for Experiential Education.
12.
KnappC. (1993). Designing processing questions to meet specific objectives. In GassM. (Ed.), Adventure therapy. Boulder, CO: Association for Experiential Education.
13.
LentzB.SmithM.SentkowskiA.SeidmanM. (1976). Teaching through adventure. Hamilton, MA: Project Adventure.
14.
NadlerR.LucknerJ. (1992). Processing the adventure experience. Dubuque, IA: Kendall/Hunt.
15.
OTAB - NZ Outdoor Training Advisory Board (1980). Outdoor training guide and logbook. Wellington: OTAB.
RohnkeK. (1989). Cowstails and cobras II. Dubuque, IA: Kendall/Hunt.
21.
RohnkeK. (1993). The bottomless bag again. Dubuque, IA: Kendall/Hunt.
22.
SchoelJ.ProutyD.RadcliffeP. (1988). Islands of healing. Hamilton, MA: Project Adventure.
23.
TempelR.ZischkeL.GilsdorfR.LoserS. (1994). Entdeckungen und begegnungen im alten land [Discoveries and encounters in the old land]. Umwelterziehung praktisch (31), 21–23.
24.
TrommerG. (1991). Natur wahrnehmen mit der Rucksackschule [Experience nature with the backpack school]. Braunschweig: Westermann.