@book{203231,
	author = {Institut filosofii (Akademii︠a︡ nauk SSSR)},
	title = {A leap through the centuries /},
	publisher = {Progress,},
	year = {1968.},
	address = {Moscow :},
	note = {Translation of Ot srednevekovʹi︠a︡ k vershinam sovremennogo progressa.}
}