Cita APA (7th ed.)

TYAGI,A.P. (1976). An Introduction to Palaeontology (2nd ed.). Chand and Company.

Cita Chicago (17th ed.)

TYAGI,A.P. An Introduction to Palaeontology. 2nd ed. New Delhi: Chand and Company, 1976.

Cita MLA (9th ed.)

TYAGI,A.P. An Introduction to Palaeontology. 2nd ed. Chand and Company, 1976.