Bhattacharya, A. K., et al. “Environmental Auditing in Ecotourism : A Study on Visitors’ Management in Van Vihar National Park, Bhopal, M.P. (India)”. Indian Forester, vol. 132, no. 2, Feb. 2006, pp. 139-48, doi:10.36808/if/2006/v132i2/3868.