Singh,Soubam Prenchandra. (2018). Eco.tourism environmental problems & sustainable development. Discovery publishing House.
Čikaški stil citiranja (17. izdanje)Singh,Soubam Prenchandra. Eco.tourism Environmental Problems & Sustainable Development. New Delhi: Discovery publishing House, 2018.
MLA način citiranja (9. izdanje)Singh,Soubam Prenchandra. Eco.tourism Environmental Problems & Sustainable Development. Discovery publishing House, 2018.
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