APA
Osafo-Kwaako P., National Bureau of Economic Research & Robinson J. A. (2013). Political centralization in Pre-Colonial Africa. Cambridge: NBER.
Chicago
Osafo-Kwaako Philip, National Bureau of Economic Research and Robinson James A. 2013. Political centralization in Pre-Colonial Africa. Cambridge: NBER.
Harvard
Osafo-Kwaako P., National Bureau of Economic Research and Robinson J. A. (2013). Political centralization in Pre-Colonial Africa. Cambridge: NBER.
MLA
Osafo-Kwaako Philip, National Bureau of Economic Research and Robinson James A. Political centralization in Pre-Colonial Africa. Cambridge: NBER. 2013.