The following books are recommended:

• Fortran 90/95 for Scientists and Engineers Chapman, Steven J.  WCB/McGraw-Hill, 1998.

This is the primary reference in developing the notes for this course.
 

• Fortran 90/95 explained  Metcalf, M. and Reid, J.  Oxford University Press, 1996.

A good reference.  Not as comprehensive, nor does it include as many examples as the others, but it is a good reference for questions of syntax and structure.  The other options give more examples and better explanations.
 

• Fortran 90 for Engineers and Scientists  Nyhoff, L. and Leestma, S.  Prentice Hall, 1997.

Basically equivalent to Chapman's book, just arranged differently.  Offers many examples of an engineering nature.  The pages referenced in the index are not always accurate and explanations are not as clear as Chapman (that's my opinion).

• Fortran 90 handbook: complete ANSI/ISO reference Adams J.C.  McGraw-Hill, 1992.

• Fortran 90 programming  Ellis T.M.R., Philips I.R., Lahey T.M.   Addison-Wesley, 1994.

WEBPAGES:

• http://wwwasdoc.web.cern.ch/wwwasdoc/f90.html

Michael Metcalf's Fortran 90 CNL Articles

• http://www.ibiblio.org/pub/languages/fortran/

A more in depth fortran guide if you want to really get involved!

• http://www.polyhedron.com/salford/products/other/ftn95_personal.html

A free fortran compiler running under windows (click DOWNLOAD NOW at the bottom of the page).

• http://gcc.gnu.org/wiki/GFortran

A free GNU fortran compiler running under windows (click Binaries under "Quick links" and then installer).