https://www.uea.ac.uk/medicine/departments/psychological-sciences/cognitive-behavioural-therapy-training/-about-iapt-and-the-history-of-the-programme/stepped-care-model-information
https://www.ncbi.nlm.nih.gov/pmc/articles/PMC3283464/
https://www.lenus.ie/bitstream/handle/10147/250780/Asteppedcareapproach.pdf?sequence=1&isAllowed=y
https://www.psychology.org.au/for-members/publications/inpsych/2018/December-Issue-6/Stepped-care-for-mental-health-treatment-A-system
https://pdfs.semanticscholar.org/1e77/aa133e9ec168d4cc674afb7ce65258cb0e07.pdf
https://jamanetwork.com/journals/jamapsychiatry/fullarticle/482992
https://wellbeinginfo.org/self-help/mental-health/stepped-care/