Warburg, B. (1935) Lettre Sur L'Etiologie Et L'Evolution Des Psychoses Collectives, Suivie De Quelques Remarques Sociologiques Concernant La Situation Historique Actuelle. (A Letter Dealing with the Etiology and Evolution of the Collective Psychoses Followed by Some Sociological Considerations Concerning the History of the Present Situation.): By Robert Waelder (Vienna). Abstract from the French translation by Anne Berman in collaboration with Princess Marie Bonaparte, revised by the author. Letter from the Third Series Correspondance entitled L'Esprit, L'Ethique et la Guerre (Intellect, Ethics and War). Institut International de Coopération Intellectuelle. Société des Nations 1934. P. 85–150.. Psychoanalytic Quarterly 4:633-639