Cita APA (7th ed.)

Engel, E. (1999). Poisoned grapes, mad cows and protectionism. National Bureau of Economic Research.

Cita Chicago (17th ed.)

Engel, Eduardo. Poisoned Grapes, Mad Cows and Protectionism. Cambridge: National Bureau of Economic Research, 1999.

Cita MLA (9th ed.)

Engel, Eduardo. Poisoned Grapes, Mad Cows and Protectionism. National Bureau of Economic Research, 1999.