1. Observation as a Technique for Recreation Research;Burch,1974
2. Participant Observation in Outdoor Recreation;Campbell;Journal of Leisure Research,1970
3. Tourist Motivation: An Appraisal;Dann;Annals of Tourism Research,1981
4. Ethics in Social and Behavioral Research;Diener,1978
5. Das raeumliche Verhalten junger nordamerikanischer Touristen in Bayern — Ein Beispiel fuer Staedtetourismus;Hartmann,1976