1. Agassi, J. (1975). Science in flux. Dordrecht: Reidel.
2. American Psychiatric Association. (2000). Diagnostic and statistical manual of mental disorders (4th ed text-revised). Washington, DC: American Psychiatric Association.
3. Bandura, A. (1976). Social learning theory. Upper Saddle River, NJ: Prentice Hall.
4. Bonk, T. (2008). Underdetermination: An essay on evidence and the limits of natural knowledge. Dordrecht: Springer.
5. Boyatzis, R. E. (1998). Transforming qualitative information: Thematic analysis and code development. Thousand Oaks, CA: Sage.