References
- ASTM D4956-07e1 . 2007 . Standard Specification for Retroreflective Sheeting for Traffic Control , West Conshohoken, PA : ASTM International .
- CIE 54.2–2001, Retroreflection: Definition and Measurement; Technical Report for CIE Central Bureau: Vienna, Austria. http://www.cie.co.at
- ASTM E808-01 2009 . 2009 . Standard Practice for Describing Retroreflection , West Conshohoken, PA : ASTM International .
- Miller , CC , Heimer , T and Early , E . 2005 . “ National Calibration Facility for Retroreflective Traffic Control Materials ” . In National Cooperative Highway Research Program Web-Only Document 72 (Project 05-16) , Washington, DC : Transportation Research Board . April
- ASTM E809-08. 2008 . Standard Practice for Measuring Photometric Characteristics of Retroreflectors , West Conshohoken, PA : ASTM International .
- ASTM E810-03 2008 . 2008 . Standard Test Method for Coefficient of Retroreflection of Retroreflective Sheeting Utilizing the Coplanar Geometry , West Conshohoken, PA : ASTM International .
- NIST/SEMATECH. e-Handbook of Statistical Methods, 2008. http://www.itl.nist.gov/div898/handbook/ (accessed Jun 1, 2009)