APA-viite

Thornbury ,William D. (2006). Principles of geomorphology (2nd.). New Age.

Chicago-tyylinen lähdeviittaus

Thornbury ,William D. Principles of Geomorphology. 2nd. New Delhi: New Age, 2006.

MLA-viite

Thornbury ,William D. Principles of Geomorphology. 2nd. New Age, 2006.