Harker, A. (1923). Petrology for students: An introduction to the study of rocks under the microscope (6. edition, revised.). University Press.
Chicago-Zitierstil (17. Ausg.)Harker, Alfred. Petrology for Students: An Introduction to the Study of Rocks Under the Microscope. 6. edition, revised. Cambridge: University Press, 1923.
MLA-Zitierstil (9. Ausg.)Harker, Alfred. Petrology for Students: An Introduction to the Study of Rocks Under the Microscope. 6. edition, revised. University Press, 1923.
Achtung: Diese Zitate sind unter Umständen nicht zu 100% korrekt.