Pedro A. Fuertes-Olivera,Marisol Velasco-Sacristán,Ascensión Arribas-Baño,Eva Samaniego-Fernández.Persuasion and advertising English: Metadiscourse in slogans and headlines[J].Journal of Pragmatics,2001.
Dann Graham.Language of Tourism: A Sociolinguistic Perspective[J].1996.