1. Camman, C., Fichman, M., Jenkins, D. & Klesh, J. (1983). Assessing the attitudes and perceptions of organizational members. In S. Seashore, E. Lawer, P Mirvis, & C. Camman (Eds.), Assessing organizational change: A guide to methods, measures, and practices. New York: John Wiley & Sons, Inc.
2. Hair, J., Black, W, Babin, B., Anderson, R. & Tetham, R. (2013). Multivariate data analysis (8th. ed.). Upper Saddle River, NJ: Pearson Prentice Hall, Inc.
3. Moloney, R. (2013). Empty cap syndrome. Supply Chain Europe Magazine (May/June), 35.
4. Ringle, C. M., Wende, S. & Will, A. (2005). SmartPLS 2.0 (M3) beta. Hamburg: SmartPLS. Retrieved from http://www.smartpls.com.