Lewis, P. W. Unser Vortex 1914: Percy Windham Lewis. 1895 - 1941.(1998).
Lua i Stíl Chicago (17ú heag.)Lewis, Percy Windham. "Unser Vortex 1914: Percy Windham Lewis." 1895 - 1941.(1998) .
Lua MLA (8ú heag.)Lewis, Percy Windham. "Unser Vortex 1914: Percy Windham Lewis." 1895 - 1941.(1998), .
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