1. NF P 94-057, Soils Investigation and Testing - Granulometric Analysis - Hydrometer Method,1992
2. NF P 94-056, Soil: Investigation and Testing - Granulometric Analysis - Dry Sieving Method after Washing,1996
3. NF P 94-068, Soils: Investigation and Testing - Measuring of the Methylene Blue Absorption Capacity of a Rocky Soil - Determination of the Methylene Blue of a Soil by Means of the Stain Test,1998
4. Earth building construction process in Benin city, Nigeria and engineering classification of earth materials used;Akinwumi;Indian J. Tradit. Knowl.,2014
5. Référentiel Pédologique. Quae. Association française pour l’étude du sol;Baize,2008