Wurfel, S. W. 1. (1965). Foreign enterprise in Colombia: Laws and policies. University of North Carolina Press.
शिकागो शैली (17वां संस्करण) प्रशस्ति पत्रWurfel, Seymour W. 1907. Foreign Enterprise in Colombia: Laws and Policies. Chapel Hill: University of North Carolina Press, 1965.
एमएलए (9वां संस्करण) प्रशस्ति पत्रWurfel, Seymour W. 1907. Foreign Enterprise in Colombia: Laws and Policies. University of North Carolina Press, 1965.
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