1. Agrios, G. N. 1969. Plant Pathology. Academic Press, New York.
2. Alexander, L., et al. 1974. Remote Sensing Environmental and Geotechnical Applications. The State of the Art. Engineering Bulletin 45. Dames and Moore, Los Angeles, California.
3. Allan, J. A. 1980. Remote sensing in land and land use studies. Geography, Vol. 65, Part I, No. 286, pp. 35–44.
4. Anderson, J. R. 1971. Land use classification schemes used in selected recent geographic applications of remote sensing. Photogrammetric Engineering 37 (4): 379–387.
5. Anderson, J. R., et al. 1976. A Land Use and Land Cover Classification System for Use with Remote Sensor Data. Geological Survey Professional Paper 964. U.S. Govt. Printing Office, Washington, D.C.