एपीए उद्धरण

Kaushal, P., & Sharma, S. P. (2011). Ecological and environmental impact of tourism. Kanishka.

शिकागो स्टाइल उद्धरण

Kaushal, Prerna, और Shashi Prabha Sharma. Ecological and Environmental Impact of Tourism. New Delhi: Kanishka, 2011.

एमएलए उद्धरण

Kaushal, Prerna, और Shashi Prabha Sharma. Ecological and Environmental Impact of Tourism. Kanishka, 2011.