Ramsey, W. L. (1969). Modern earth science. Rinehart and Winston.
Cita Chicago Style (17a ed.)Ramsey, William L. Modern Earth Science. New York: Rinehart and Winston, 1969.
Cita MLA (9a ed.)Ramsey, William L. Modern Earth Science. Rinehart and Winston, 1969.
Precaución: Estas citas no son 100% exactas.