1. Notes on the Interlanguage of Comity;Aston,1993
2. Systemic linguistics and discourse analysis: a multi-layered approach to exchange structure;Berry,1981
3. Cross-Cultural Pragmatics: Requests and Apologies,1989
4. Universals in language usage: politeness phenomena;Brown,1978
5. Politeness: Some Universals in Language Usage;Brown,1987