@book{23427,
	author = {Schmidt, B. F.},
	title = {Trigonometrie vir senior sertifikaat en matrikulasie :},
	publisher = {Juta,},
	year = {[1955].},
	address = {Kaapstad :},
	edition = {4de uitg.},
	note = {Also available in English under title: Trigonometry for senior certificate and matriculation : standards IX and X.}
}