Zadra C. The external tutor in PCTO (Training of Transversal Competences and Orientation): Invisible teacher in search of circularity between theory and practice. EXIOA [Internet]. 2020 Jun. 24 [cited 2025 Apr. 2];5(1). Available from: https://journals.francoangeli.it/index.php/exioa/article/view/10075