APA
Richardson J. D., Zhang C., . (1999). Revealing comparative advantage : chaotic or coherent patterns across time and sector and U.S. trading partner?. Cambridge, Mass: National Bureau of Economic Research.
Chicago
Richardson J David, Zhang Chi, . 1999. Revealing comparative advantage : chaotic or coherent patterns across time and sector and U.S. trading partner?. Cambridge, Mass: National Bureau of Economic Research.
Harvard
Richardson J. D., Zhang C., . (1999). Revealing comparative advantage : chaotic or coherent patterns across time and sector and U.S. trading partner?. Cambridge, Mass: National Bureau of Economic Research.
MLA
Richardson J David, Zhang Chi, . Revealing comparative advantage : chaotic or coherent patterns across time and sector and U.S. trading partner?. Cambridge, Mass: National Bureau of Economic Research. 1999.