APA (7 ম সংস্করণ) উদ্ধৃতি

United Nations Environment Programme. Division of Early Warning and Assessment. (2006). Geo year book 2006: An overview of our changing environment. UNEP Division of Early Warning and Assessment.

শিকাগো স্টাইল (17 তম সংস্করণ) উদ্ধৃতি

United Nations Environment Programme. Division of Early Warning and Assessment. Geo Year Book 2006: An Overview of Our Changing Environment. Nairobi: UNEP Division of Early Warning and Assessment, 2006.

M.L.A (9 ম সংস্করণ) উদ্ধৃতি

United Nations Environment Programme. Division of Early Warning and Assessment. Geo Year Book 2006: An Overview of Our Changing Environment. UNEP Division of Early Warning and Assessment, 2006.