APA
Block S., National Bureau Of Economic Research, . (2010). The Decline and Rise of Agricultural Productivity in Sub-Sah. Cambridge: NBER.
Chicago
Block Steven, National Bureau Of Economic Research, . 2010. The Decline and Rise of Agricultural Productivity in Sub-Sah. Cambridge: NBER.
Harvard
Block S., National Bureau Of Economic Research, . (2010). The Decline and Rise of Agricultural Productivity in Sub-Sah. Cambridge: NBER.
MLA
Block Steven, National Bureau Of Economic Research, . The Decline and Rise of Agricultural Productivity in Sub-Sah. Cambridge: NBER. 2010.