APA (7th ed.) Citation

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

Chicago Style (17th ed.) Citation

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

MLA (9th ed.) Citation

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