D. T. Campbell and D. W. Fiske (1959). Convergent and Discriminant Validation by the Multitrait Multimethod Matrix. In: Psychological Bulletin, Volume 56(2): S. 81–105, doi:10.1037/h0046016.
Podsakoff, P. M., MacKenzie, S. B., Lee, J.-Y. & Podsakoff, N. P. (2003). Common method biases in behavioral research: A critical review of the literature and recommended remedies. Journal of Applied Psychology, 88, 879–903, doi:10.1037/0021-9010.88.5.879.
