Estolas, Josefina V.
Fundamentas of research
Miranda, 1973
 Buku Teks SO
Moore, Nick
How to do research : a practical guide to designing and managing research projects
Facet Publishing, 2006
 Buku Teks SO
Rees, Colin
An introduction to research for midwives / Colin Rees
Churchill Livingstone/Elsevier, 2012
 Buku Teks SO
Yin, Robert K.
Case study research: design and methods
SAGE Publication, 1989
 Buku Teks SO
Yin, Robert K.
Case study research: design and methods
SAGE Publication, 1985
 Buku Teks SO