1. American Society for Testing and Materials (2008). Standard Specification for Mortar for Unit Masonry (ASTM C 170 -00) ASTM C170, USA.
2. American Society for Testing and Materials (2005). Standard Specification for Aggregate for Masonry (ASTM C 144 -05) ASTM C144, USA.
3. British Standards Institution (2002). Aggregates for mortar, (BS EN 13139), UK.
4. Jozef, Jasiczak and Zielinski, K, Effect of protein additive on properties of mortar, J. of Cement and Concrete Composites, ScienceDirect. 28(5) (2006) 451-457.
5. Benito, Casu, Fabio, and Tegiacchi, Alkylsulfonated polysaccharides and mortar and concrete mixes containing them, Hackh's Chem. Dictionary (1988). Information on http: /www. freepatentsonline. com/H000493. html (Dec. 23, 2012).