Case study research: Principles and practices. Gerring J. J Gerring - 2006 - books.google.com GSID: UVaqG-_SPj0J
Case study research: Design and methods. [No authors listed] RK Yin - 2009 - books.google.com GSID: -Zab-xl4Z9IJ
Rigour in qualitative case-study research. Casey D, Houghton C, Murphy K. C Houghton, D Casey, D Shaw, K Murphy - Nurse researcher, 2013 - journals.rcni.com GSID: uyIitzYHf3QJ