Di Sarno, A.D. et al. 2025. Validity and effectiveness of Gestalt Play Therapy: a proposal for defining a shared research protocol. Phenomena Journal - International Journal of Psychopathology, Neuroscience and Psychotherapy. 7, 3 (Sep. 2025), 98–105. DOI:https://doi.org/10.32069/PJ.2021.2.241.