Swanborn (2010) Case Study Research SAGE, London
Thomas (2011) How To Do Your Case Study SAGE, London
Yin (2008) Case Study Research 4e SAGE, California
Swanborn (2010) Case Study Research SAGE, London
Thomas (2011) How To Do Your Case Study SAGE, London
Yin (2008) Case Study Research 4e SAGE, California