Adams, John, Khan, Hafiz T.A. ORCID: https://orcid.org/0000-0002-1817-3730 and Raeside, Robert (2014) Research methods for business and social science students. 2nd edition. Sage, Los Angeles, USA. ISBN 9788132113669
Adams, John, Khan, Hafiz T.A. ORCID: https://orcid.org/0000-0002-1817-3730, Raeside, Robert and White, David (2007) Research methods for graduate business and social science students. SAGE, London. ISBN 9780761935896