References
- Burch , William R. 1974 . “In Democracy is the Preservation of Wilderness.” . Appalachia. ,
- LaPage , Wilbur F. and Ragain , D. P. 1975 . Family Camping Trends—An Eight Year Panel Study , U.S. Forest Service Research Paper
- Stankey , George . 1979 . “A framework for social behavior research—applied issues,” . In Long Distance Trails: The Appalachian Trails—A Guide to Future Research and Management Needs , Edited by: Burch , William R. Jr. 43 – 53 . New Haven : Yale University .
- Wilson , Edward O. 1975 . Sociobiology: The New Synthesis , Cambridge : Harvard University Press .