@book{175393,
	author = {Seminar on Methods Used in Long-term Social Planning and Policy-making, and United Nations.},
	title = {Approaches and methods used in long-term social planning and policy-making;},
	publisher = {United Nations,},
	year = {1973.},
	address = {New York,},
	note = {"United Nations publication. Sales no. E.73.II.E.7."}
}