It is studied in several subfields of linguistics&colon; historical linguistics, sociolinguistics, and evolutionary linguistics. It is particularly influential in interactional sociolinguistics, discourse analysis and discursive psychology. It is a concept mostly associated with sociolinguistics and anthropological linguistics. In the 1980s, Australian linguists discussed the application of linguistics and sociolinguistics to legal issues. Cameron is mainly interested in sociolinguistics and linguistic anthropology. Drawing from sociolinguistics and linguistic anthropology, raciolinguistics focuses on race and its relation to language. Linguistic prestige is a central research topic within sociolinguistics. The concept has started to influence the fields of sociolinguistics and linguistic anthropology. Sociolinguistics (1994-1998) and of Glottology and Linguistics (1998-2013). "Face" is central to sociology and sociolinguistics. Charles A. Ferguson, a founder of sociolinguistics, coined "diglossia" in 1959. Language variation is a core concept in sociolinguistics. This is a topic of a great deal of research in current syntax and sociolinguistics. Research in the field of sociolinguistics was paying little attention to social hierarchy and power. In the field of sociolinguistics, social network describes the structure of a particular speech community.