Emacs Manual: http://www.gnu.org/software/emacs/manual/html_mono/emacs.html

etags Manual: http://www.delorie.com/gnu/docs/emacs/etags.1.html

Make Manual: http://css.sfu.ca/nsg/cssnetdocs/doc/make/make_toc.html

GDB Manual: http://www.delorie.com/gnu/docs/gdb/gdb_toc.html

CVS Manual: http://www.cs.utexas.edu/users/dahlin/Classes/UGOS/reading/CVS-FAQ.txt

C++ Reference: http://www.cs.utexas.edu/users/dahlin/Classes/UGOS/reading/c++.pdf

C Reference: http://www-h.eng.cam.ac.uk/help/tpl/languages/C/teaching_C