1. British Standards Institution (2011). BS EN 14081: 2011 Strength graded structural timber with rectangular cross section. London: BSI.
2. British Standards Institution (2009). BS EN 338:2009 Structural timber. Strength classes. London: BSI.
3. British Standards Institution (2008). BS EN 1995-1-1: 2004+A1 Eurocode 5. Design of timber structures. General. Common rules and rules for buildings. London: BSI.
4. British Standards Institution (2007) BS 4978:2007 Visual strength grading of softwood. London: BSI.
5. British Standards Institution (2004). PAS 104:2004 Wood recycling in the panelboard manufacturing industry. Specification for quality and guidance for good practice for the supply of post consumer wood for consumption in the manufacture of panelboard products. London: BSI.