@book{57039,
	author = {Jonker, Gerrit Jan Abraham. and Jonker, A.J.Th.},
	title = {Levensernst},
	publisher = {V.d. Brink},
	year = {[1925]},
	address = {Zutphen},
	edition = {2e dr.},
	note = {1e dr.: Heemstede : Hoekendijk, 1924.}
}