Coburn, John W.
Precalculus / John W. Coburn
McGraw-Hill, 2010
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Barnett, Raymond A.
Precalculus : functions and graphs
McGraw-HIll, 2001
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Heckenbach, Alan J.
Elementary functions : an approach to precalculus mathematics
Macmillan, 1970
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Torchinsky, Alberto
Real variables / Alberto Torchinsky
Addison-Wesley, 1987
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Graves, Lawrence M.
The theory of functions of real variables / Lawrence M. Graves
McGraw-Hill, 1956
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