Cita APA (7th ed.)

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

Cita Chicago (17th ed.)

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

Cita MLA (9th ed.)

Spencer, Edgar W. Introduction to the Structure of the Earth. McGraw-Hill, 1988.