Periodicals
- Magazin of Art
- Letter from: 7.11.1945, Croton-on-Hudson (N.Y.)
- Manchester Guardian
- Letter from: 20.7.1936, Jerusalem
- Letter from: 11.8.1937, Jerusalem
- Melos. Zeitschrift für neue Musik [gegründet 1920]
- Letter from: 10.5.1920, Königsberg (Germany)
- Letter from: 11.5.1920, Charlottenburg
- Letter from: 13.5.1920, Charlottenburg
- Letter from: 30.6.1920, Charlottenburg
- Letter from: 19.1.1925, Fürstenberg (Germany)
- Letter from: 12.7.1928, Charlottenburg
- Letter from: 21.7.1928, Kampen auf Sylt
- Menorak [Zeitschrift?]
- Letter from: 7.4.1948, San Francisco
- Monatsheft
- Letter from: 19.11.1917, Dünastellung
- Münchner Neueste Nachrichten
- Letter from: 13.5.1917, Oberammergau (Germany)