APA
Hummels D., Lugovskyy Volodymyr & National Bureau Of Economic Research. (2005). Trade in ideal varieties: Theory and evidence. Cambridge, MA: NBER.
Chicago
Hummels David, Lugovskyy Volodymyr and National Bureau Of Economic Research. 2005. Trade in ideal varieties: Theory and evidence. Cambridge, MA: NBER.
Harvard
Hummels D., Lugovskyy Volodymyr and National Bureau Of Economic Research. (2005). Trade in ideal varieties: Theory and evidence. Cambridge, MA: NBER.
MLA
Hummels David, Lugovskyy Volodymyr and National Bureau Of Economic Research. Trade in ideal varieties: Theory and evidence. Cambridge, MA: NBER. 2005.
