[1]
P. L. J. Domone and J. M. Illston, Construction materials: their nature and behaviour, 4th ed. Milton Park, Abingdon, Oxon: Spon Press, 2010 [Online]. Available: http://encore.lib.warwick.ac.uk/iii/encore/record/C__Rb3059306
[2]
T. H. G. Megson, Structural and stress analysis, Third edition. Oxford, UK: Butterworth-Heinemann is an imprint of Elsevier, 2014 [Online]. Available: http://encore.lib.warwick.ac.uk/iii/encore/record/C__Rb2821754