Lerner, N. D.; Collins, B. L.
view article (9.993612)
Assessment of Safety Symbol Understandability by Different Testing Methods.
National Bureau of Standards, Washington, DC
NBSIR 80-2088,
August 1980,
60 p.
Collins, B. L.; Pierman, B. C.
view article (9.992496)
Evaluation of Safety Symbols.
National Bureau of Standards, Gaithersburg, MD
NBSIR 79-1760,
June 1979,
37 p.