Cita APA (7a ed.)
Harker, A. (1965). The Natural history of igneous. Hafner.
Cita Chicago Style (17a ed.)
Harker, Alfred. The Natural History of Igneous. New York: Hafner, 1965.
Cita MLA (9a ed.)
Harker, Alfred. The Natural History of Igneous. Hafner, 1965.
Precaución: Estas citas no son 100% exactas.