Cita APA (7th ed.)
Duchrow, U. (1992). Europe in the world system. WCC.
Cita Chicago (17th ed.)
Duchrow, Ulrich. Europe in the World System. Geneva: WCC, 1992.
Cita MLA (9th ed.)
Duchrow, Ulrich. Europe in the World System. WCC, 1992.
Atenció: Aquestes cites poden no estar 100% correctes.