2011

Marcus, A. (2011), Design, User Experience, and Usability. Theory, Methods, Tools and Practice - First International Conference, DUXU 2011, Held as Part of HCI International 2011, Orlando, FL, USA, July 9-14, 2011, Proceedings, Part I , Springer , Berlin, Germany .

2005

George, A. L. & Bennett, A. (2005), Case Studies and Theory Development in the Social Sciences , MIT Press .

2002

Popper, K. R. (2002), The Logic of Scientific Discovery , Taylor & Francis .

2000

Klein, K. J. & Kozlowski, S. W. J., ed. (2000), Multilevel Theory, Research, and Methods in Organizations: Foundations, Extensions, and New Directions , Jossey Bass .