Cita APA (7th ed.)

Siebert, H. (1999). The world economy. Routledge.

Cita Chicago (17th ed.)

Siebert, Horst. The World Economy. London: Routledge, 1999.

Cita MLA (9th ed.)

Siebert, Horst. The World Economy. Routledge, 1999.