12. Qualitative research in counselling and psychotherapy McLeod, John, 1951- Los Angeles : SAGE, 2011 CP607
13. Single-case research designs: methods for clinical and applied settings Kazdin, Alan E. New York ; Oxford University Press, 2011. CP607
14. Single-case research design and analysis: new directions for psychology and education London : Routledge, Taylor & Francis Group, 2015. CP607
