Case Study As a Research by Susan K. Soy (1997)
Case Study Overview
https://www.ischool.utexas.edu/~ssoy/usesusers/l391d1b.htm
With a good reference section for Case Study Methodology
Click https://www.ischool.utexas.edu/~ssoy/usesusers/l391d1b.htm link to open resource.