Seligman, Martin E P Positive psychology progress: empirical validation of interventions. [electronic resource] - The American psychologist - 410-21 p. digital Publication Type: Clinical Trial; Journal Article; Randomized Controlled Trial; Research Support, Non-U.S. Gov't ISSN: 0003-066X Standard No.: 10.1037/0003-066X.60.5.410 doi Subjects--Topical Terms: Depressive Disorder--therapyDiagnostic and Statistical Manual of Mental DisordersHappinessHumansInternetPersonalityPsychology--trendsPsychotherapySocial ValuesStress, Psychological--psychology