- Husserl, Edmund, 1859-1938 (3)
- Adorno, Theodor W., 1903-1969 (2)
- Nietzsche, Friedrich Wilhelm, 1844-1900 (2)
- Claesges, Ulrich, 1937- (1)
- Kern, Iso (1)
- McRae, R. F. (1)
- Mill, John Stuart, 1806-1873 (1)
- Robson, John M. (John Mercel), 1927- (1)
- Strasser, S. (1)