Voigt, K., & Lipgens, W. (1984). Continental Plans for Eurpean Union 1939 - 1945: Ideas of the Italian Resistance. Walter de Gruyter.
Lua i Stíl Chicago (17ú heag.)Voigt, Klaus, agus Walter Lipgens. Continental Plans for Eurpean Union 1939 - 1945: Ideas of the Italian Resistance. Berlin; New York: Walter de Gruyter, 1984.
Lua MLA (8ú heag.)Voigt, Klaus, agus Walter Lipgens. Continental Plans for Eurpean Union 1939 - 1945: Ideas of the Italian Resistance. Walter de Gruyter, 1984.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.