APA

Spencer E. W., . (1988). Introduction to the structure of the earth. New York: McGraw-Hill.

Chicago

Spencer Edgar W, . 1988. Introduction to the structure of the earth. New York: McGraw-Hill.

Harvard

Spencer E. W., . (1988). Introduction to the structure of the earth. New York: McGraw-Hill.

MLA

Spencer Edgar W, . Introduction to the structure of the earth. New York: McGraw-Hill. 1988.