APA

Petersen M., Rigby J., . (1994). Interpreting Earth History: a manual in Historical Geology. New York: [s.n.].

Chicago

Petersen M.S, Rigby J.K, . 1994. Interpreting Earth History: a manual in Historical Geology. New York: [s.n.].

Harvard

Petersen M., Rigby J., . (1994). Interpreting Earth History: a manual in Historical Geology. New York: [s.n.].

MLA

Petersen M.S, Rigby J.K, . Interpreting Earth History: a manual in Historical Geology. New York: [s.n.]. 1994.