eleish, g. (1962). an introduction to the input- output model. the institute of national planning.
Chicago (17e ed.) Bronvermeldingeleish, g. An Introduction to the Input- Output Model. cairo: the institute of national planning, 1962.
MLA (9e ed.) Bronvermeldingeleish, g. An Introduction to the Input- Output Model. the institute of national planning, 1962.