Gupta R.K. (2007). Sustainable tourism planning/1e. Sumit Enterprise.
Chicago Edition CitationGupta R.K. Sustainable Tourism Planning/1e. New Delhi: Sumit Enterprise, 2007.
Cita MLAGupta R.K. Sustainable Tourism Planning/1e. Sumit Enterprise, 2007.
Atenció: Aquestes cites poden no estar 100% correctes.