hammam, e. e. d. (1963). economics of agricultural production and resource use. the institute of national planning.
Cytowanie według stylu Chicago (wyd. 17)hammam, ezz el din. Economics of Agricultural Production and Resource Use. cairo: the institute of national planning, 1963.
Cytowanie według stylu MLA (wyd. 9)hammam, ezz el din. Economics of Agricultural Production and Resource Use. the institute of national planning, 1963.