APA
Allen T., National Bureau of Economic Research, Arkolakis C. & Takahashi Y. (2014). Universal gravity. Cambridge: NBER.
Chicago
Allen Treb, National Bureau of Economic Research, Arkolakis Costas and Takahashi Yuta. 2014. Universal gravity. Cambridge: NBER.
Harvard
Allen T., National Bureau of Economic Research, Arkolakis C. and Takahashi Y. (2014). Universal gravity. Cambridge: NBER.
MLA
Allen Treb, National Bureau of Economic Research, Arkolakis Costas and Takahashi Yuta. Universal gravity. Cambridge: NBER. 2014.