Babl, A., Eubanks, C.F. and Goldfried, M.R. 2024. A 21st Century Principle-Based Training Approach to Psychotherapy: A Contribution to the Momentum of Transtheoretical Work. Clinical Psychology in Europe. 6, (Apr. 2024), 1-12. DOI:https://doi.org/10.32872/cpe.11925.