Gumplowicz, W. (1915). Russia and Poland during the present war. [s.n.].
Citazione stile Chigago Style (17a edizione)Gumplowicz, Władysław. Russia and Poland During the Present War. Lausanne: [s.n.], 1915.
Citatione MLA (9a ed.)Gumplowicz, Władysław. Russia and Poland During the Present War. [s.n.], 1915.
Attenzione: Queste citazioni potrebbero non essere precise al 100%.