1. Hothersall, D.: History of Psychology, 4th edn. McGraw-Hill, New York (2004)
2. The National Coalition of Creative Arts Therapies Associations,
http://www.nccata.org/
3. The American Horticultural Therapy Association,
http://ahta.org/
4. Page, M.: Gardening as a therapeutic intervention in mental health. Nursing Times 104(45), 28–30 (2008)
5. Nevis, E.: Introduction. In: Nevis, E. (ed.) Gestalt Therapy: Perspectives and Applications, p. 3. Gestalt Press, Cambridge (2000)