APA
Anderson J. E., National Bureau Of Economic Research, . (2009). Gravity, Productivity and the Pattern of Production and Trad. Cambridge: NBER.
Chicago
Anderson James E, National Bureau Of Economic Research, . 2009. Gravity, Productivity and the Pattern of Production and Trad. Cambridge: NBER.
Harvard
Anderson J. E., National Bureau Of Economic Research, . (2009). Gravity, Productivity and the Pattern of Production and Trad. Cambridge: NBER.
MLA
Anderson James E, National Bureau Of Economic Research, . Gravity, Productivity and the Pattern of Production and Trad. Cambridge: NBER. 2009.
