Goldstein, Harvey
Multilevel models in educational and social research
Charles Griffin, 1987
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Gibbs, Graham R
Analysing qualitative data
Sage , 2013
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Analysing qualitative data in psychology
Evanthia Lyons, Adrian Coyle
Sage, 2007
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Ehrenberg, A.S.C.
Data reduction : analysing and interpreting statistical data
John Wiley & Sons, 1975
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Philosophy, methodology and educational research
Blackwell Publishing, 2007
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