Estolas, Josefina V.
Fundamentas of research
Miranda, 1973
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Moore, Nick
How to do research : a practical guide to designing and managing research projects
Facet Publishing, 2006
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Rees, Colin
An introduction to research for midwives / Colin Rees
Churchill Livingstone/Elsevier, 2012
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Fowler, Floyd J.
Survey research methods
Sage Publications, 2002
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Operations research Jilid I
Erlangga, 2007
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