Articles and Books: There are many good books on linear algebra, including the following:

Axler, S. (2004) Linear Algebra Done Right, Springer-Verlag.
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Farin, G. and D. Hansford (2004) Practical Linear Algebra: A Geometry Toolbox, AK Peters.
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Strang, G. (1993) Introduction to Linear Algebra, Wellesley-Cambridge Press.
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WWW Pages: There are many good WWW pages devoted to linear algebra, including the following: