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17.
http://www.cnx.rice.edu/conent/m10245/lastest/18.
http://simon.cs.vt.edu/SoSci/converted/glossary.html19.
http://www.wadsworth.com/psychology_d/templates/student_resources/workshops/res_methd/sampling/sampling_29.html
20.
http://www.cemca.org/books/chap13.htm21.
http://www.sfrc.ufl.edu/Class/fnr3410c/LectNotes/Msse/msse.htm22.
http://www.ryerson.ca/~mjoppe/ResearchProcess/ConvenienceSample.htm23.
http://www2.uta.edu/sswmindel/S6324/Class%20Materials/Sampling/Nonprobability%20Sampling.htm
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