APA
Atack J. e. a., National Bureau Of Economic Research, . (2009). Did Railroads Induce or Follow Economic Growth? Urbanization. Cambridge: NBER.
Chicago
Atack Jeremy et al, National Bureau Of Economic Research, . 2009. Did Railroads Induce or Follow Economic Growth? Urbanization. Cambridge: NBER.
Harvard
Atack J. e. a., National Bureau Of Economic Research, . (2009). Did Railroads Induce or Follow Economic Growth? Urbanization. Cambridge: NBER.
MLA
Atack Jeremy et al, National Bureau Of Economic Research, . Did Railroads Induce or Follow Economic Growth? Urbanization. Cambridge: NBER. 2009.