1. Amidžić, L., Krasulja, S., & Belij, S. (Eds.) (2007). Zaštićena prirodna dobra Srbije [Protected Natural Resources in Serbia]. Beograd: Ministarstvo zaštite životne sredine, Zavod za zaštitu prirode Srbije.;
2. Bennett, N. J., Whitty, T. S., Finkbeiner, E., Pittman, J., Bassett, H., Gelcich, S., & Allison, E. H. (2018). Environmental Stewardship: A Conceptual Review and Analytical Framework. Environmental Management, 61(4), 597-614. https://doi.org/10.1007/s00267-017-0993-2;
3. Bosak, K. (2016). Tourism, Development and Sustainability. In: S. F. McCool, & K. Bosak (Eds.), Reframing Sustainable Tourism (pp. 33-44). New York: Springer. https://doi.org/10.1007/978-94-017-7209-9;
4. Brankov, J. (2010). Ekološki turizam u zaštićenim objektima prirode u Banatu, knjiga 81 [Ecological Tourism in Protected Natural Assets in Banat, Special Issues № 81]. Beograd: Geografski institut "Jovan Cvijić", Srpska akademija nauka i umetnosti.;
5. Buckley, R. (2013). Defining Ecotourism: Consensus on Core, Disagreement on Detail. In: R. Ballantyne, & J. Packer (Eds.), International Handbook on Ecotourism (pp. 9-14). Cheltenham: Edward Elgar.;