Cita APA (7a ed.)

Heywood, P. (1991). Spain's next five years: A political risk analysis. The Economist Intelligence Unit.

Cita Chicago Style (17a ed.)

Heywood, Paul. Spain's Next Five Years: A Political Risk Analysis. London: The Economist Intelligence Unit, 1991.

Cita MLA (9a ed.)

Heywood, Paul. Spain's Next Five Years: A Political Risk Analysis. The Economist Intelligence Unit, 1991.