Pierce, E. T.; Kelly, K. L.; McPherson, M. A.; Howett, G. L.; Booker, R. L.
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Emergency Vehicle Warning Devices. Interim Review of the State-of-the-Art Relative to Performance Standards.
National Bureau of Standards, Washington, DC
NBS 10 478,
May 1972,
Howett, G. L.; Kelly, K. L.; Pierce, E. T.
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Emergency Vehicle Warning Lights: State of the Art. Final Report.
National Bureau of Standards, Washington, DC
Law Enforcement Assistance Admin., Washington, DC,
NBS SP 480-16,
September 1978,