Ewald, W. R. (1968). Environment and change: The next fifty years. Bloomington: Indiana University.
Citación estilo ChicagoEwald, William R. Environment and Change: The Next Fifty Years. Bloomington: Indiana University, 1968.
Cita MLAEwald, William R. Environment and Change: The Next Fifty Years. Bloomington: Indiana University, 1968.
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