1. V. Beltrán: Tile e Brick Int. Vol. 11 (3) (1995), p.169.
2. Conorsa, 2010. Available at < http: /www. conorsa. es>. Acessed in October, (2010).
3. E. Sánchez, J. García, V. Sanz and E. Ochandio: Cerám. Información Vol. 157 (1990), p.13.
4. American Society for Testing and Materials (2006). ASTM 1272/2006, Standard Specification for Heavy Vehicular Paving Brick.
5. Colombian Technical Norm (2002). NTC 5282/2002, Clay paver for pedestrian and heavy vehicular traffic. (in Spanish).