@book{17555,
	author = {Kohnstamm, Ph. and Langeveld, M.J.},
	title = {Keur uit het didactisch werk van Prof. Dr Ph. Kohnstamm /},
	publisher = {Wolters,},
	year = {1952.},
	address = {Groningen [etc.] :},
	edition = {2e dr.},
	note = {1e dr.: 1948.}
}