APA

Clifford N., . (1996). Encredible Earth. New York: A DK Publishing Book.

Chicago

Clifford Nick, . 1996. Encredible Earth. New York: A DK Publishing Book.

Harvard

Clifford N., . (1996). Encredible Earth. New York: A DK Publishing Book.

MLA

Clifford Nick, . Encredible Earth. New York: A DK Publishing Book. 1996.