Παραπομπή σε μορφή APA (7η εκδ.)

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.

Παραπομπή σε μορφή Chicago (17η εκδ.)

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.

Παραπομπή σε μορφή MLA (9th εκδ.)

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.