Robert Michels e la Prima Guerra mondiale lettere e documenti (1913-1921) - Michels, Robert 1876-1936 (Leo S. Olschki editore, 2019)
Letters to R. Michels (1876-1936), sociologist; also includes his letters and documents, mostly publ. for the first time. - Includes preface and introductory texts (pages 1-89)