Lua APA (7ú heag.)
Fennell, D. A. (2002). Ecotourism programme planning. CABI Pub..
Lua i Stíl Chicago (17ú heag.)
Fennell, David A. Ecotourism Programme Planning. Wallingford, Oxon, UK ; New York, NY: CABI Pub., 2002.
Lua MLA (9ú heag.)
Fennell, David A. Ecotourism Programme Planning. CABI Pub., 2002.
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