APA

Hancock P. L., Skinner B. J., . (2000). The Oxford companion to the Earth. New York: Oxford Univ. Press.

Chicago

Hancock Paul L, Skinner Brian J, . 2000. The Oxford companion to the Earth. New York: Oxford Univ. Press.

Harvard

Hancock P. L., Skinner B. J., . (2000). The Oxford companion to the Earth. New York: Oxford Univ. Press.

MLA

Hancock Paul L, Skinner Brian J, . The Oxford companion to the Earth. New York: Oxford Univ. Press. 2000.