APA (7th ed.) Citation

Harker, A. (1964). Petrology for students: An introduction to the study of rocks under the microscope (8th ed.). University Press.

Chicago Style (17th ed.) Citation

Harker, Alfred. Petrology for Students: An Introduction to the Study of Rocks Under the Microscope. 8th ed. Cambridge [England]: University Press, 1964.

MLA (9th ed.) Citation

Harker, Alfred. Petrology for Students: An Introduction to the Study of Rocks Under the Microscope. 8th ed. University Press, 1964.