http://owl.english.purdue.edu/owl/section/2/8/
http://nutsandbolts.washcoll.edu/evidence.html
http://www.writing.ku.edu/~writing/guides/original.shtml
http://www.writing.ku.edu/~writing/guides/primary.shtml
http://www.sass.uottawa.ca/writing/kit/stage2-research-evaluate.php