Cita APA

Helpman, E. (1998). The structure of foreign trade. National Bureau of Economic Research.

Citación estilo Chicago

Helpman, Elhanan. The Structure of Foreign Trade. Cambridge: National Bureau of Economic Research, 1998.

Cita MLA

Helpman, Elhanan. The Structure of Foreign Trade. National Bureau of Economic Research, 1998.

Warning: These citations may not always be 100% accurate.