1. Using sand for winter maintenance, Road Management Journal, Wisconsin Transportation Bulletin, March 1996.
2. Soleymani Kermani, Mohammad Reza (1995)"Mechanical re-texturing of road surface aggregates", PhD Thesis in the Department of Civil Engineering, Queen Mary and Westfield College, University of London .
3. British Standards Institute (1990) "Method for determination of polished stone value (PSV), BS 812: Part 114, London.
4. British Standards Institute (2006) "Surface texture measurement on local roads", PPR148, London.