https://sites.google.com/site/mathematicalreasoning3ed/
http://www.math.vt.edu/people/day/ProofsBook/
http://giam.southernct.edu/GIAM/
For anybody looking for freely available maths related texts online, three great resources are:
http://aimath.org/textbooks/approved-textbooks/
http://web.archive.org/web/20170126161813/http://people.math...
http://www.openculture.com/free-math-textbooks
https://sites.google.com/site/mathematicalreasoning3ed/
http://www.math.vt.edu/people/day/ProofsBook/
http://giam.southernct.edu/GIAM/
For anybody looking for freely available maths related texts online, three great resources are:
http://aimath.org/textbooks/approved-textbooks/
http://web.archive.org/web/20170126161813/http://people.math...
http://www.openculture.com/free-math-textbooks