Cita APA (7th ed.)

Eicher, D. L. (1968). Geologic time. Prentice-Hall.

Cita Chicago (17th ed.)

Eicher, Don L. Geologic Time. Englewood Cliffs, N.J.: Prentice-Hall, 1968.

Cita MLA (8th ed.)

Eicher, Don L. Geologic Time. Prentice-Hall, 1968.