<p>Here are two very good, free online books:</p>
<p><a href=“http://ocw.mit.edu/ans7870/resources/Strang/strangtext.htm[/url]”>http://ocw.mit.edu/ans7870/resources/Strang/strangtext.htm</a>
<a href=“http://www.math.wisc.edu/~keisler/calc.html[/url]”>http://www.math.wisc.edu/~keisler/calc.html</a></p>