(1980). Thresholds in geomorphology. Allen and Unwin.
Cita Chicago (17th ed.)Thresholds in Geomorphology. London: Allen and Unwin, 1980.
Cita MLA (9th ed.)Thresholds in Geomorphology. Allen and Unwin, 1980.
Atenció: Aquestes cites poden no estar 100% correctes.