Warntz, W., & Wolff, P. (1971). Breakthrough in geography. New York: Plume Book.
Citación estilo ChicagoWarntz, William, y Peter Wolff. Breakthrough in Geography. New York: Plume Book, 1971.
Cita MLAWarntz, William, y Peter Wolff. Breakthrough in Geography. New York: Plume Book, 1971.
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