1. Jones L, Kyle J, Wood P. Words apart: losing your hearing as an adult. London: Tavistock Publications, 1987.
2. Morgan-Jones RA. Hearing differently: the impact of hearing impairment on family life. London: Whurr Publishers Ltd, 2001.
3. Guba EG, Lincoln YS. Fourth generation evaluation. Newbury Park, California: London, 1989.
4. Denzin NK, Lincoln YS. Strategies of qualitative inquiry. California: SAGE Publications Inc, 1988.
5. Miller WL, Crabtree BF. Clinical Research: A Multimethod Typology and Qualitative Roadmap. In: Crabtree BF, Miller WL editors. Doing Qualitative Research, 2rd ed. London: Sage Publications Inc, 1999.