Harker, A. (1902). Petrology for students: An introduction to the study of rocks under the microscope (3rd ed.). University Press.
Citace podle Chicago (17th ed.)Harker, Alfred. Petrology for Students: An Introduction to the Study of Rocks Under the Microscope. 3rd ed. Cambridge: University Press, 1902.
Citace podle MLA (8th ed.)Harker, Alfred. Petrology for Students: An Introduction to the Study of Rocks Under the Microscope. 3rd ed. University Press, 1902.
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