Harker, A. (1919). Petrology for students: An introduction to the study of rocks under the microscope (5th ed.). The University Press.
Chicago Style (17th ed.) CitationHarker, Alfred. Petrology for Students: An Introduction to the Study of Rocks Under the Microscope. 5th ed. Cambridge, UK: The University Press, 1919.
MLA (9th ed.) CitationHarker, Alfred. Petrology for Students: An Introduction to the Study of Rocks Under the Microscope. 5th ed. The University Press, 1919.
Warning: These citations may not always be 100% accurate.