Cita APA (7a ed.)

Milligan, G. C. (1977). The Changing earth: An introduction to geology. McGraw-Hill Ryerson.

Cita Chicago Style (17a ed.)

Milligan, George C. The Changing Earth: An Introduction to Geology. Toronto: McGraw-Hill Ryerson, 1977.

Cita MLA (9a ed.)

Milligan, George C. The Changing Earth: An Introduction to Geology. McGraw-Hill Ryerson, 1977.