Nałkowski, Wacław (1851–1911)

Kautsky, Karl (1854–1938)

Dybowski, Benedykt (1833–1930)

Gall, Stanisław (1865–1942) Tauer, Antoni (1873–1910)

Høffding, Harald (1843–1931)

Stephan, Wiktor

Zaborowski, Stanisław

Jellinek, Georg (1851–1911)

Buisson, Ferdinand (1841–1932)

Jaurès, Jean (1859–1914) Lafargue, Paul (1842–1911)

Høffding, Harald (1843–1931)

Kovalevskij, Maksim Maksimovič (1851–1916)

Adamski, Józef Stanisław (1854–1926)

Michaud d'Humiac, Léon.

Bogdanov, Aleksandr Aleksandrovič (1873–1928)

Lancaster, Charles. J. S. Tł.

Stephan, Wiktor (1865–1923)

Konczyński, Tadeusz (1875–1944)

Weulersse, Georges (1874-1950). Autor Lorentowicz, Jan (1868–1940) Gebethner i Wolff.

Rygier, Leon (1875–1948)

Bornik, Franciszek (1870–1906)

Łopaciński, Hieronim (1860–1906)