APA (7 ম সংস্করণ) উদ্ধৃতি

Ager, D. V. (1963). Principles of paleoecology: An introduction to the study of how and where animals and plants lived in the past. McGraw-Hill.

শিকাগো স্টাইল (17 তম সংস্করণ) উদ্ধৃতি

Ager, Derek V. Principles of Paleoecology: An Introduction to the Study of How and Where Animals and Plants Lived in the Past. New York: McGraw-Hill, 1963.

M.L.A (9 ম সংস্করণ) উদ্ধৃতি

Ager, Derek V. Principles of Paleoecology: An Introduction to the Study of How and Where Animals and Plants Lived in the Past. McGraw-Hill, 1963.