Betz, F. (1975). Environmental geology. Dowden, Hutchinson & Ross.
Cita Chicago Style (17a ed.)Betz, Frederick. Environmental Geology. Stroudsburg, Pa.: Dowden, Hutchinson & Ross, 1975.
Cita MLA (8a ed.)Betz, Frederick. Environmental Geology. Dowden, Hutchinson & Ross, 1975.
Precaución: Estas citas no son 100% exactas.