APA (7th ed.) Citation
Harker, A. (1923). Petrology for students: An introduction to the study of rocks under the microscope. Cambridge University press.
Chicago Style (17th ed.) Citation
Harker, Alfred. Petrology for Students: An Introduction to the Study of Rocks Under the Microscope. Cambridge: Cambridge University press, 1923.
MLA (9th ed.) Citation
Harker, Alfred. Petrology for Students: An Introduction to the Study of Rocks Under the Microscope. Cambridge University press, 1923.
Warning: These citations may not always be 100% accurate.