APA (7th ed.) Zitazioa

Johnston, R. J. (1976). The World trade system: Some enquires into its spatial structure. G. Bell.

Chicago Style (17th ed.) Zitazioa

Johnston, R. J. The World Trade System: Some Enquires into Its Spatial Structure. London: G. Bell, 1976.

MLA (9th ed.) Zitazioa

Johnston, R. J. The World Trade System: Some Enquires into Its Spatial Structure. G. Bell, 1976.