1. CeLSIUS 2013 Social class www.ucl.ac.uk/celsius/online-training/socio/se040100
2. Chandler , D. Tetlow , G 2014 Employment and retirement-Explaining recent trends http://www.ifs.org.uk/publications/7413
3. Cridland , J 2017 Independent review of the State Pension Age. Smoothing the transition. Final report https://assets.publishing.service.gov.uk/government/uploads/system/uploads/attachment_data/file/611460/independent-review-of-the-state-pension-age-smoothing-the-transition.pdf