Cita APA (7th ed.)

Dyer, J. R. (1994). A History of the earth. Pravesh Books International.

Cita Chicago (17th ed.)

Dyer, John R. A History of the Earth. New Delhi: Pravesh Books International, 1994.

Cita MLA (9th ed.)

Dyer, John R. A History of the Earth. Pravesh Books International, 1994.