Mepụta ụdị okwu a dị mgbagwoju anya Mpịakọta nke mbụ, " The Economic Point of View ", pụtara na Disemba 2009.
N'ezie, ihe dị mgbagwoju anya nke ahịrịokwu ahụ bụ "Mpịakọta nke mbụ,''Economic Point of View,'' pụtara na Disemba 2009, na mpịakọta nke abụọ, 'Theory of Market and the Price System,'na May 2011. "