South Carolina Department of Transportation (2011). "Guide Signs – SC Route Marker"(PDF). SCDOT Supplement to the MUTCD. No page number; pp. 200–201 of .pdf document. Signs M1-5-30 (conventional roads) and M1-5-45 (expressways).
"SC Street Finder". South Carolina Department of Transportation. October 8, 2013. Retrieved June 18, 2014.
South Carolina Department of Transportation (2011). "Guide Signs – Secondary Route Marker"(PDF). SCDOT Supplement to the MUTCD. No page number; p. 204 of .pdf document. Signs M1-15-20-D/F (left or right arrow) and M1-15-24-D/F (both arrows).