References:

• World Business Council for Sustainable Development - Cement Sustainability Initiative - About the Cement Industry. (2010). Retrieved October 12, 2011, from World Business Council for Sustainable Development - Cement Sustainability Initiative Website: http://www.wbcsdcement.org/index.php?option=com_content&task=view&id=40&Itemid=95
• Concrete Network - Timeline of Concrete & Cement History. (2011) Retrieved October 27, 2011, from Concrete Network.com Website: http://www.concretenetwork.com/concrete-history
• CSI - Getting the Numbers Right - indic 333-world-2009. (2010). Retrieved October 12, 2011, from World Business Council for Sustainable Development - Cement Sustainability Initiative Website: http://www.wbcsdcement.org/GNR-2009/world/GNR-Indicator_333-world-2009.html
• McLemore Concrete Construction – Facts About Concrete. (2011). Retrieved October 27, 2011, from McLemore Concrete Construction Website: http://www.mclemore-construction.com/facts/
• Hardy Cement Fishing - Cement Facts. (2011). Retrieved October 27, 2011, from Hardy Cement Website: hardycementfinishing.com/cement-facts