Twardowski, Kazimierz (1866–1938)
Twardowski, Kazimierz (1866–1938)
Fagnot, François (1866–1939)
Biegański, Władysław (1857–1917)
Appel, Karol (1857–1930)
Buisson, Ferdinand (1841–1932) Renard, Georges Francis (1847–1930) Séailles, Gabriel (1852–1923)
Kautsky, Karl (1854–1938)
Kautsky, Karl (1854–1938)
Lafargue, Paul (1842–1911)
Kautsky, Karl (1854–1938)
Miklaševskij, Aleksandr Nikolaevič (1864–1911)