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| | general references (Site not responding. Last check: 2007-10-10) |
 | | (1981), Naidoo (1983), Naidoo (1985), Naidoo (1986), Naidoo (1987), Naidoo (1988), Naidoo (1990), Naidoo and Mundree (1993), Naidoo and Naidoo (1981), Naidoo and Naidoo (1992), Naidoo and Naicker (1992), Naidoo and Rughunanan (1992), Naidoo et al. |
 | | (1984), Dye and Furstenberg (1981), Emmerson (1988), Forbes and Cyrus (1993), Gess (1995), Giffen (1963), Grindley (1974), Grindley (1980), Grindley (1981), Grindley and Heydorn (1979), Grindley and von Schirnding (1983), Hart (1995), Hart and Allanson (1975), Hart and Allanson (1976), Heinecken et al. |
 | | (1983), Heydorn (1972a), Heydorn (1972b), Heydorn (1973), Heydorn (1976), Heydorn (1979), Heydorn (1981a), Heydorn (1981b), Heydorn (1982), Heydorn (1986), Heydorn (1989), Heydorn and Tinley (1980), Hill (1981b), Hilmer (1991), Hilmer (1992), Hockey and Turpie (1999), Hockey et al. |
| www.ru.ac.za /org/cerm/Alanlit/refgenrl.htm (1265 words) |
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