- Nietzsche, Friedrich Wilhelm, 1844-1900 (2)
- Andreas-Salomé, Lou, 1861-1937 (1)
- Baumann, H. (1)
- Bernstein, Eduard, 1850-1932 (1)
- Bleibtreu, Karl (1)
- Brachmann, Walter (1)
- Cathrein, Victor, 1845-1931 (1)
- Elster, Alexander (1)
- Fridrichowicz, Eugen (1)
- Holzer, Ernst (1)
- Kaden, Ernst (1)
- Kant, Immanuel, 1724-1804 (1)
- Kassner, Rudolf, 1873-1959 (1)
- Key, Ellen Karolina Sofia, 1849-1926 (1)
- Klatt, B. (1)
- Klatt, Edmund (1)
- Mackay, John Henry, 1864-1933 (1)
- Muret, Eduard, 1833-1904 (1)
- Sacerdote, Gustavo (1)
- Sanders, D. (1)
- Schäfer, Wilhelm, 1868-1952 (1)
- Stirner, Max, 1806-1856 (1)
- no value (1)