Stamp, L. (1973). An Intermediate commercial geography P-I Commodities & world trade (5th.). Longman Group ltd.
Lua i Stíl Chicago (17ú heag.)Stamp, L. An Intermediate Commercial Geography P-I Commodities & World Trade. 5th. London: Longman Group ltd, 1973.
Lua MLA (9ú heag.)Stamp, L. An Intermediate Commercial Geography P-I Commodities & World Trade. 5th. Longman Group ltd, 1973.
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