APA
Sala-i-Martin X. X., National Bureau Of Economic Research, . (1997). I just ran four million regresions. Cambridge, MA: NBER.
Chicago
Sala-i-Martin Xavier X, National Bureau Of Economic Research, . 1997. I just ran four million regresions. Cambridge, MA: NBER.
Harvard
Sala-i-Martin X. X., National Bureau Of Economic Research, . (1997). I just ran four million regresions. Cambridge, MA: NBER.
MLA
Sala-i-Martin Xavier X, National Bureau Of Economic Research, . I just ran four million regresions. Cambridge, MA: NBER. 1997.