McKillup, Steve
Statistics explained : an introductory guide for life sciences
Cambridge University Press, 2011
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Milton, Janet Susan
Statistical methods in the biological and health sciences
McGraw-Hill , 1992
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Milton, Janet Susan
Statistical methods in the biological and health sciences
McGraw-Hill, 1983
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Creswell, John W.
Research design : qualitative, quantitative, approaches
Sage, 1994
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Analyzing qualitative data
edited by Alan Bryman, Robert G. Burgess
Routledge , 1995
 Buku Teks SO