Παραπομπή APA

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

Παραπομπή Chicago Style

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

Παραπομπή MLA

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