Johnston, R. J. (1976). The world trade system: Some enquiries into its spatial structure. St. Martin's Press.
Chicago-referens (17:e uppl.)Johnston, Ronald John. The World Trade System: Some Enquiries into Its Spatial Structure. New York: St. Martin's Press, 1976.
MLA-referens (9:e uppl.)Johnston, Ronald John. The World Trade System: Some Enquiries into Its Spatial Structure. St. Martin's Press, 1976.
Varning: dessa hänvisningar är inte alltid fullständigt riktiga.