http://www.dartmouth.edu/~writing/materials/student/ac_paper/style.shtml
http://web.uvic.ca/wguide/Pages/SentTooLong.html
http://web.uvic.ca/wguide/Pages/SentRep.html
http://web.uvic.ca/wguide/Pages/SentVariation.html
http://www.sdc.uwo.ca/writing/handouts/Sentence%20Patterns.pdf