@book{677,
	author = {Roos, Willem Lodewyk.},
	title = {Prestasieprofiele vir hoëvlakwerkkrag :},
	publisher = {Raad vir Geesteswetenskaplike Navorsing,},
	year = {1985.},
	address = {Pretoria :},
	note = {Summary in Afrikaans and English.}
}