1. ADIF. Pliego de Prescripciones Técnicas para los proyectos de plataforma [PGP-2006, PGP-2008 y PGP-2011].
2. ASTM D1196/D1196M – 12(2016). Standard test method for nonrepetitive static plate load tests of soils and flexible pavement components, for use in evaluation and design of airport and highway pavements.
3. ASTM D1556/D1556M. Standard test method for density and unit weight of soil in place by sand-cone method.
4. ASTM D2922-05. Standard test methods for density of soil and soil-aggregate in place by nuclear methods (shallow depth) (withdrawn 2007).
5. ASTM D3017-05. Standard test method for water content of soil and rock in place by nuclear methods (shallow depth) (withdrawn 2007).