The best introductory textbooks as recommended by previous students

Campbell JB, 2006. Introduction to Remote Sensing. New York: Guilford Press. 4th Edition.
Longley PA, Goodchild MF, Maguire DJ and Rhind DW, 2005. Geographical Information Systems and Science. New York: Wiley. 2nd Edition.
Longley PA, Goodchild MF, Maguire DJ and Rhind DW (eds.), 1999. Geographical Information Systems: Principles, Techniques, Management and Applications. New York: Wiley.
 

Other recommended textbooks

Albrecht J, 2007. Key Concepts and Techniques in GIS. London : SAGE Publications.
Chainey S and Ratcliffe J, 2005. GIS & Crime Mapping. Chichester: Wiley.
Chrisman N, 2001. Exploring Geographic Information Systems. New York: John Wiley & Sons. 2nd Edition.
DeMers MN, 2004. Fundamentals of Geographic Information Systems. New York: Wiley. 3rd Edition.
Grimshaw DJ, 1999. Bringing Geographical Information Systems into Business. London: Longman. 2nd edition.
Heywood I, Cornelius S and Carver S, 2006. An Introduction to GIS. New York: Pearson. 3rd edition.
Jensen JR, 2006. Remote Sensing of Environment: An Earth Resource Perspective. New Jersey: Prentice Hall. 2nd edition.
Jensen JR, 2004. Introductory Digital Image Processing: A Remote Sensing Perspective. New Jersey: Prentice Hall. 3rd edition.

Lillesand TM, Kiefer RW and Chipman JW, 2004. Remote Sensing and Image Interpretation. Chichester: Wiley. 5th edition.

Longley PA et al. (eds.), 1998. Geocomputation: A Primer. Chichester: Wiley.

O'Sullivan D and Unwin D, 2002. Geographic Information Analysis. Chichester: Wiley.

Reeve D and Petch J, 1999. GIS, Organisations and People: A Socio-technic Perspective. London: Taylor and Francis.

Richards JA and Jia X, 2006. Remote Sensing Digital Image Analysis: An Introduction. Berlin: Springer. 4th edition.
Schowengerdt RA, 2007. Remote Sensing: Methods and Models for Image Processing. San Diego: Academic Press. 3rd edition.
Worboys MF and Duckham M, 2004. GIS: A Computing Perspective. Boca Raton: CRC Press. 2nd edition.

Zeiler M, 1999. Modeling Our World: The ESRI Guide to Geodatabase Design. Redlands: ESRI Press.