Supawadee Santipraditkul. 1999. Frozen phrases of goodwill in the English language : sales letters written by Bangkok hotel sales staff. Department of Language and Linguistics, Ramkhamhaeng University;

Supawadee Santipraditkul. Frozen phrases of goodwill in the English language : sales letters written by Bangkok hotel sales staff. . Bangkok:Ramkhamhaeng University, 1999.

Supawadee Santipraditkul. (1999) Frozen phrases of goodwill in the English language : sales letters written by Bangkok hotel sales staff . Ramkhamhaeng University/Bangkok.