21.↑ F. von Richthofen (1882). "On the mode of origin of the loess". Geological Magazine (Decade II). 9 (7): 293–305. doi:10.1017/S001675680017164X.↑ Arthur Getis; Judith Getis and Jerome D. Fellmann (2000). Introduction to Geography, Seventh Edition. McGraw-Hill. p. 99. ISBN 0-697-38506-X.↑  name=Erosion↑ Science Daily (1999-07-14). "African Dust Called A Major Factor Affecting Southeast U.S. Air Quality". සම්ප්‍රවේශය 2007-06-10.↑ Science Daily (2001-06-15). "Microbes And The Dust They Ride In On Pose Potential Health Risks". සම්ප්‍රවේශය 2007-06-10.↑ Usinfo.state.gov (2003). "Study Says African Dust Affects Climate in U.S., Caribbean" (PDF). සම්ප්‍රවේශය 2007-06-10.↑ U. S. Geological Survey (2006). "Coral Mortality and African Dust". සම්ප්‍රවේශය 2007-06-10. {{cite web}}: External link in |author= (help)↑ J. Gurevitch, S. M. Scheiner, and G. A. Fox (2006). Plant Ecology, 2nd ed. Sinauer Associates, Inc., Massachusetts.{{cite book}}:  CS1 maint: multiple names: authors li