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).
Chicago-viite (17. p.)Harmsen, Robert, ja Menno Spiering. "Euroscepticism and the Evolution of European Political Debate: Robert Harmsen. Menno Spiering." Euroscepticism : Party Politics, National Identity and European Integration.(2004) .
MLA-viite (8. p.)Harmsen, Robert, ja Menno Spiering. "Euroscepticism and the Evolution of European Political Debate: Robert Harmsen. Menno Spiering." Euroscepticism : Party Politics, National Identity and European Integration.(2004), .
Varoitus: Nämä viitteet eivät aina ole täysin luotettavia.