Eksport: юрамалар арасында аерма

*Joshi, Rakesh Mohan, (2009) International Business, Oxford University Press, New Delhi and New York ISBN 0-19-568909-7

*Sullivan, Arthur; Sheffrin, Steven M. (2003). Economics: Principles in Action. Upper Saddle River: Pearson Prentice Hall. p. 552. ISBN 0-13-063085-3.