Ajetunmobi, O. (2002) Making sense of critical appraisal [online]. London, Hodder Arnold. Available from: https://www.dawsonera.com/guard/protected/dawson.jsp?name=https://athensla.uwe.ac.uk/oala/metadata&dest=http://www.dawsonera.com/depp/reader/protected/external/AbstractView/S9781444165272.
Aveyard, H. and Sharp, P. (2009) A beginner’s guide to evidence based practice in health and social care professions [online]. Maidenhead, McGraw-Hill Open University Press. Available from: https://www.dawsonera.com/guard/protected/dawson.jsp?name=https://athensla.uwe.ac.uk/oala/metadata&dest=http://www.dawsonera.com/depp/reader/protected/external/AbstractView/S9780335239078.
Bhopal, R.S. (2016) Concepts of epidemiology: integrating the ideas, theories, principles, and methods of epidemiology Third edition. [online]. Oxford, Oxford University Press. Available from: http://www.vlebooks.com/vleweb/product/openreader?id=WofEngland&isbn=9780191060144.
Bowling, A. and Ebrahim, S. (2005) Handbook of health research methods: investigation, measurement and analysis [online]. Maidenhead, Open University Press. Available from: http://tinyurl.com/y49t4689.
Campbell, M.J. and Swinscow, T.D.V. (2009) Statistics at square one 11th ed. [online]. Chichester, Wiley-Blackwell. Available from: http://www.vlebooks.com/vleweb/product/openreader?id=WofEngland&isbn=9781444306330.
Coggon, D., Rose, G. and Barker, D.J.P. (2003) Epidemiology for the uninitiated 5th ed. [online]. [London], BMJ. Available from: http://www.vlebooks.com/vleweb/product/openreader?id=WofEngland&isbn=9781405146104.
Curtis, E.A. and Drennan, J. (eds.) (2013) Quantitative health research: issues and methods [online]. Maidenhead, Open University Press. Available from: https://www.dawsonera.com/guard/protected/dawson.jsp?name=https://athensla.uwe.ac.uk/oala/metadata&dest=http://www.dawsonera.com/depp/reader/protected/external/AbstractView/S9780335245741.
Gordis, L. (2013) Epidemiology Fifth edition. [online]. Philadelphia, Elsevier/Saunders. Available from: https://www.dawsonera.com/guard/protected/dawson.jsp?name=https://athensla.uwe.ac.uk/oala/metadata&dest=http://www.dawsonera.com/depp/reader/protected/external/AbstractView/S9781455742516.
Petrie, A. and Sabin, C. (2009) Medical statistics at a glance 3rd ed. [online]. At a glance series, Chichester, Wiley-Blackwell. Available from: http://www.vlebooks.com/vleweb/product/openreader?id=WofEngland&isbn=9781118782453.
