Lua APA (7ú heag.)

Robertson, D. (1972). International trade policy. Macmillan.

Lua i Stíl Chicago (17ú heag.)

Robertson, David. International Trade Policy. London: Macmillan, 1972.

Lua MLA (9ú heag.)

Robertson, David. International Trade Policy. Macmillan, 1972.

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