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Charnley, Susan (1 March 2005). "From Nature Tourism to Ecotourism? The Case of the Ngorongoro Conservation Area, Tanzania". Human Organization. 64 (1): 75–88. doi:10.17730/humo.64.1.u8fer0aap3ceg4a1. S2CID143748520.
West, Paige; Carrier, James G. (August 2004). "Ecotourism and Authenticity: Getting Away from It All?". Current Anthropology. 45 (4): 483–498. doi:10.1086/422082. S2CID224790170.
Walker, Brian G.; Dee Boersma, P.; Wingfield, John C. (February 2006). "Habituation of Adult Magellanic Penguins to Human Visitation as Expressed through Behavior and Corticosterone Secretion: Habituation in Magellanic Penguin Adults". Conservation Biology. 20 (1): 146–154. doi:10.1111/j.1523-1739.2005.00271.x. PMID16909667. S2CID32718406.