1. American association of state Highway and transportation Officials;AASHTO M145-91;Classif. Soils Soil-Aggregate Mix. Highw. Constr. Purp,2008
2. Test for Plastic Limit of a Soil;AENOR,1993
3. Determination of the Liquid Limit of a Soil by the Casagrande Apparatus Method;AENOR,1994
4. Geotechnics. Compaction Test. Normal Proctor;AENOR,1994
5. Geotechnics. Compaction Test. Modified Proctor;AENOR,1994