@book{21307,
	author = {Van Dyk, J. J. and Bouwer, E.},
	title = {Algemene wetenskap in aksie :},
	publisher = {De Jager-HAUM,},
	year = {1986.},
	address = {Pretoria :},
	edition = {1ste sagtebanduitg.},
	note = {Naam van uitgewer verander na: Kagiso Publishers.}
}