Cita APA (7th ed.)

Gribbin, J., & Gribbin, M. (2002). Ice age. Barnes & Noble, Inc.

Cita Chicago (17th ed.)

Gribbin, John, i Mary Gribbin. Ice Age. New York: Barnes & Noble, Inc, 2002.

Cita MLA (9th ed.)

Gribbin, John, i Mary Gribbin. Ice Age. Barnes & Noble, Inc, 2002.