@book{2520,
	author = {Lockhart, R.H. Bruce and Keep, John Leslie Howard,},
	title = {The two revolutions :},
	publisher = {Bodley Head,},
	year = {cop. [1967]},
	series = {A Background book},
	address = {London [etc.] :},
	note = {1e uitg.: 1957.}
}