Encyclopaedia of ecotourism (v.1)/

Eitemau Tebyg

• Encyclopaedia of ecotourism (v.2)/
  gan: P C Sinha (ed.)
  Cyhoeddwyd: (2003)
• Encyclopaedia of ecotourism (v.3)/
  gan: P C Sinha (ed.)
  Cyhoeddwyd: (2003)
• Encyclopaedia of the ecotourism
  gan: Trivedi, Priya Ranjan
  Cyhoeddwyd: (2006)
• International encyclopaedia of sustainable and ecotourism (vol.1) : ecotourism and sustainable development
  gan: Romila Chawla
  Cyhoeddwyd: (2011)
• Encyclopaedia of travel, tourism and ecotourism Vol-1 /
  gan: P. C Sinha
  Cyhoeddwyd: (2005)