Cita APA (7a ed.)

Hummels, D., Rapoport, D., & Yi, K. (1998). Vertical specialization and the changing nature of world trade. [s.n.].

Cita Chicago Style (17a ed.)

Hummels, David, Dana Rapoport, y Kei-Mu Yi. Vertical Specialization and the Changing Nature of World Trade. [S.l.]: [s.n.], 1998.

Cita MLA (9a ed.)

Hummels, David, et al. Vertical Specialization and the Changing Nature of World Trade. [s.n.], 1998.