共 66 条
- [1] Adelman B. J. E., 1982, Leisure Sciences, V5, P45, DOI 10.1080/01490408209512989
- [2] ALDER J, 1996, ENVIRON MANAGE, V4, P541
- [3] [Anonymous], 1973, INT142 USDA FOR SERV
- [4] [Anonymous], INT176 USDA FOR SERV
- [5] [Anonymous], [No title captured]
- [6] Becker R. H., 1984, Leisure Sciences, V6, P475, DOI 10.1080/01490408409513049
- [7] Blamey R. K., 1995, NATURE ECOTOURISM
- [8] CLARK RN, 1979, PNW98 USDA FOR SER R