Corbet, J. H. (2008). Landforms laboratory manual: A customized version of physical geography manual (Sixth edition.).
Chicago-referens (17:e uppl.)Corbet, John H. Landforms Laboratory Manual: A Customized Version of Physical Geography Manual. Sixth edition. Duboque, Iowa : Kendall/Hunt Publishing Company, 2008.
MLA-referens (9:e uppl.)Corbet, John H. Landforms Laboratory Manual: A Customized Version of Physical Geography Manual. Sixth edition. 2008.
Varning: dessa hänvisningar är inte alltid fullständigt riktiga.