Cita APA (7th ed.)

Puga, D., & Venables, A. (1997). Preferential Trading Arrangements and Industrial Location.

Cita Chicago (17th ed.)

Puga, D., i A. Venables. Preferential Trading Arrangements and Industrial Location. 1997.

Cita MLA (9th ed.)

Puga, D., i A. Venables. Preferential Trading Arrangements and Industrial Location. 1997.

Atenció: Aquestes cites poden no estar 100% correctes.