@book{35307,
	author = {Husen, Torsten (Ed.)},
	title = {Diffentiation and guidance report on the sigtuna},
	publisher = {Almquist and Wiksell},
	year = {1959},
	address = {Stockholm},
	note = {Report on the Sigtuna Course organized by the Swedish Government under the auspices of the council of Europe August,1958}
}