@book{251875,
	author = {United Nations. Department of International Economic and Social Affairs.},
	title = {Basic methodological principles governing the compilation of the system of statistical balances of the national economy : Volume 1 /},
	publisher = {United Nations,},
	year = {1989.},
	series = {Studies in methods series F ; no. 17/ rev. 1  },
	address = {New York : }
}