Brown, P. & Levinson, S. (1978). Universals in language usage: Politeness phenomena. In E. Goody (Ed.), Qu estions and Politeness: Strategies in Social Interaction (pp. 56-311). Cambridge: Cambridge University Press.
Fraser, B. (2005). Whither politeness. In R. Lakoff& S. Ide (Eds.), Broadening the Horizon of Linguistic Politeness (pp. 65-83). Philadelphia: John Benjamins.
Gilks, K. (2010). Is the Brown and Levinson (1987) model of politeness as useful and infl uential as originally claimed? An assessment of the revised Brown and Levinson (1987) model. Innervate, 2, 94-102.
Jansen, F. & Janssen, D. (2010). Effects of positive politeness strategies in business letters. Journal of Pragmatics, 42 (9), 2531-2548.10.1016/j.pragma.2010.02.013
Kitamura, N. (2000). Adapting Brown and Levinson’s politeness theory to casual conversation. In K. Allan & J. Henderson (Eds.), Proceedings of ALS2k, the 2000 Conference of the Australian Linguistic Society (pp. 163-169). Melbourne: University of Melbourne.
Koutlaki, S.A. (2002). Offers and expressions of thanks as face enhancing acts: tæ’arof in Persian. Journal of Pragmatics, 34 (12), 1733-1756.10.1016/S0378-2166(01)00055-8
Maier, P. (1992). Politeness strategies in business letters by native and non-native English speakers. English for Specific Purposes, 11 (3), 189-205.10.1016/S0889-4906(05)80009-2
Nickerson, C. (1999). The use of politeness strategies in business letters. In R. Geluykens & K. Pelsemakers (Eds.), Discourse in Professional Contexts (pp. 127-142). Munchen: Lincom.
Pikor-Niedzialek, M. (2005). A critical overview of politeness theories in discourse analysis: The scope of politeness - different approaches towards the politeness phenomena. Studia Anglica Resoviensia, 3, 105-113.
Pilegaard, M. (1997). Politeness in written business discourse: A text linguistic perspective on requests. Journal of Pragmatics, 28 (2), 223-244.10.1016/S0378-2166(96)00084-7
Wadsorn, N. (2008). Thai and Non-Thai reader perceptions on politeness strategies in letters of request in English. Paper presented at the International Conference on Language: Language Diversity and National Unity. Royal Institute of Thailand, Bangkok, Thailand.