William D. Thornbury. (2002). Principles of Geomorphology (2nd.). CBS.
Chicago Edition CitationWilliam D. Thornbury. Principles of Geomorphology. 2nd. NewDelhi: CBS, 2002.
MLA Edition CitationWilliam D. Thornbury. Principles of Geomorphology. 2nd. CBS, 2002.
Warning: These citations may not always be 100% accurate.