Spelling http://owl.english.purdue.edu/owl/resource/660/01/ http://www.dlsweb.rmit.edu.au/lsu/content/4_WritingSkills/08spelling.htm
Passive Voice http://www.unc.edu/depts/wcweb/handouts/passivevoice.html http://www.sdc.uwo.ca/writing/handouts/Active%20and%20Passive%20Voice.pdf http://web.uvic.ca/wguide/Pages/SentPassiveVoice.html http://www.queensu.ca/writingcentre/handouts/passivevoice.pdf
Style 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