1. Anderwald, L. (2002). Negation in non-standard British English: Gaps, regularizations and asymmetries. London: Routledge.
2. A handbook of varieties of English;L Anderwald,2004
3. A handbook of varieties of English;J Beal,2004
4. A handbook of varieties of English;S Clarke,2004
5. A handbook of varieties of English;T Crowley,2004