http://web2.uvcs.uvic.ca/elc/StudyZone/570/pulp/hemp11.htm

http://esl.about.com/od/englishreadingskills/a/readingskills.htm

http://www.mhhe.com/socscience/english/spears/stu3/studisk/dcrs_addtl_ex/dcrs_addtl_ex_intro.htm

http://www.d.umn.edu/~jetterso/documents/CriticalThinking.pdf

http://www.greenwich.ac.uk/~bj61/talessi/tlr51.html#appendix

http://support.epnet.com/lrc/researchGuide.html