Choice Theory (CT)/Reality Therapy (RT) efficiency research and scientific support
The explanation of scientific validity of Reality Therapy approach can be found in the book: Znanstvena utemeljenost RT, (Scientific Argument for Reality Therapy), Leon Lojk, 2001.
http://opak.crolib.hr/cgi-bin/wero.cgi?p=100001&q=lojk+leon&c=41050813583
Many articles covering effectiveness and empirical testing of Choice Theory application can be found in International Journal of Choice Theory and Reality Therapy:
https://www.wglasserinternational.org/resources/journals/