Gaya APA

Lindberg, K., Hawkins, D, E. (1993). Ecotourism : a guide for planners & managers (1st ed.). North Bennington: The Ecotourism Society.

Gaya MLA

Lindberg, Kreg., Hawkins, Donald, E.. "Ecotourism : a guide for planners & managers". 1st ed. North Bennington: The Ecotourism Society, 1993. BUKU.