एपीए उद्धरण

Ager, D. V. Principles of paleoecology. McGrawhill.

शिकागो स्टाइल उद्धरण

Ager, Derek V. Principles of Paleoecology. NY: McGrawhill.

एमएलए उद्धरण

Ager, Derek V. Principles of Paleoecology. McGrawhill.