共 28 条
[1]
ALMANAC E, 1991, NATIONAL GEOGRAP FEB, P142
[3]
[Anonymous], FOREST TREES GOVT PO
[4]
Boo E., 1990, ECOTOURISM POTENTIAL
[5]
BROOKE J, 1992, NY TIMES 0606, V6, pA1
[6]
Demsetz H, 1967, AM ECON REV, V57, P347
[7]
FRANK R, 1993, COMMUNICATION 0512
[8]
Goleman Daniel, 1991, N Y Times Web, pC15
[9]
GRASSE T, 1992, COMMUNICATION 0114
[10]
HYDE W, 1991, ASS ENV RESOURCE MAY, P6