7[1]Hubler, Axel 1983 Understatements and hedges in English Amsterdam:Benjamins.
8[2]Lakoff, George 1972 "Hedges:a study in meaning criteria and the logic of fuzzy concepts".
9[3]Papers from the Regional Meeting of the Chicago Linguistec society,8,183 ～228.
10[4]Gudrun, Clemen 1997 The concept of Hedging:Origins, Approaches and Definitions In Markkanen & H.Schroder (eds):Hedging and discourse, Walter de Gruyter.Berlin.New York.
