Lingiardi, V., McWilliams, N. and Muzi, L. 2017. The contribution of Sidney Blatt’s two-polarities model to the Psychodynamic Diagnostic Manual. Research in Psychotherapy: Psychopathology, Process and Outcome. 20, 1 (Apr. 2017). DOI:https://doi.org/10.4081/ripppo.2017.242.