APA (7 ম সংস্করণ) উদ্ধৃতি

Agrahari Ravi P. (2024). Environmental Ecology, Bio diversity, Climate Change & Disaster Management: For UPSC, IES, IFoS & other State Competitive Examinations (3rd ed.). Mc Graw Hill.

শিকাগো স্টাইল (17 তম সংস্করণ) উদ্ধৃতি

Agrahari Ravi P. Environmental Ecology, Bio Diversity, Climate Change & Disaster Management: For UPSC, IES, IFoS & Other State Competitive Examinations. 3rd ed. Chennai: Mc Graw Hill, 2024.

M.L.A (9 ম সংস্করণ) উদ্ধৃতি

Agrahari Ravi P. Environmental Ecology, Bio Diversity, Climate Change & Disaster Management: For UPSC, IES, IFoS & Other State Competitive Examinations. 3rd ed. Mc Graw Hill, 2024.