Harmsen, R., & Spiering, M. Euroscepticism and the evolution of european political debate: Robert Harmsen. Menno Spiering. Euroscepticism : party politics, national identity and European integration.(2004).
Lua i Stíl Chicago (17ú heag.)Harmsen, Robert, agus Menno Spiering. "Euroscepticism and the Evolution of European Political Debate: Robert Harmsen. Menno Spiering." Euroscepticism : Party Politics, National Identity and European Integration.(2004) .
Lua MLA (8ú heag.)Harmsen, Robert, agus Menno Spiering. "Euroscepticism and the Evolution of European Political Debate: Robert Harmsen. Menno Spiering." Euroscepticism : Party Politics, National Identity and European Integration.(2004), .
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.