"Discussion Documents - Class 4F - Gateway Signs"(PDF). South African Manual for Outdoor Advertising. South African Dept. of Environmental Affairs and Tourism. Diarsipkan dari versi asli(PDF) tanggal 2011-07-16. Diakses tanggal 2009-04-13.
"Discussion Documents - Class 4F - Gateway Signs"(PDF). South African Manual for Outdoor Advertising. South African Dept. of Environmental Affairs and Tourism. Diarsipkan dari versi asli(PDF) tanggal 2011-07-16. Diakses tanggal 2009-04-13.