Stone, E. G. (2015). Giuseppe Pellizza da Volpedo: The Fourth Estate (1901). Flash Art.
Lua i Stíl Chicago (17ú heag.)Stone, Eric Golo. "Giuseppe Pellizza Da Volpedo: The Fourth Estate (1901)." Flash Art 2015.
Lua MLA (8ú heag.)Stone, Eric Golo. "Giuseppe Pellizza Da Volpedo: The Fourth Estate (1901)." Flash Art, 2015.
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