Harker, A. (1919). Petrology for students: An introduction to the study of rocks under the microscope (5th ed., rev.). The University Press.
Citace podle Chicago (17th ed.)Harker, Alfred. Petrology for Students: An Introduction to the Study of Rocks Under the Microscope. 5th ed., rev. Cambridge [Eng.]: The University Press, 1919.
Citace podle MLA (8th ed.)Harker, Alfred. Petrology for Students: An Introduction to the Study of Rocks Under the Microscope. 5th ed., rev. The University Press, 1919.
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