Heilmann, P. G. F. (1972). On the formation of red soils in the lower Crati Basin, S. Italy. International Institute for Aerial Survey and Earth Sciences.
Chicago-referens (17:e uppl.)Heilmann, P. G. F. On the Formation of Red Soils in the Lower Crati Basin, S. Italy. Enschede, Netherlands: International Institute for Aerial Survey and Earth Sciences, 1972.
MLA-referens (8:e uppl.)Heilmann, P. G. F. On the Formation of Red Soils in the Lower Crati Basin, S. Italy. International Institute for Aerial Survey and Earth Sciences, 1972.
Varning: dessa hänvisningar är inte alltid fullständigt riktiga.