APA (7th ed.) Citation

S, A., & Bardelli ,Giorgio G. (2001). The great national parks of the world. Om Book Service.

Chicago Style (17th ed.) Citation

S, Angela, and Bardelli ,Giorgio G. The Great National Parks of the World. India: Om Book Service, 2001.

MLA (9th ed.) Citation

S, Angela, and Bardelli ,Giorgio G. The Great National Parks of the World. Om Book Service, 2001.