try these - they all have extensive language attitude research bibliographies

Baker, C. (1992) Attitudes and Language. Clevedon: Multilingual Matters

Garrett, P., N. Coupland and A. Williams (2003) Investigating Language Attitudes. Cardiff: University of Wales Press.

Garrett, P. (2010) Attitudes to Language. Cambridge: Cambridge University Press.

McKenzie, R.M. (2008b) Social factors and non-native attitudes towards varieties of spoken English . International Journal of Applied Linguistics 18(1): 63-88.

McKenzie, R.M. (2010) The Social Psychology of English as a Global Language. Dordrecht, Netherlands: Springer.

McKenzie, R.M. and D. Osthus (2011) That which we call a rose by any other name would sound as sweet: Folk perceptions, status and language variation. AILA Review 24: 100-115

Marlene, Robert, thank you very much, this is really useful!

Try also with bibliography in language ideology. It is not recent, but it is very interesting.

Silverstein, Micheal. 1979. "Language structure and linguistic ideology”,193-247. In Clyne, Paul R., Hanks, William F. and Hofbauer, Carol L., eds. 1979. The Elements – A Parasession on Linguistic Units and Levels. Chicago: Chicago Linguistic Society: 193);

Heath, Shirley B. 1989. “Language ideology”, 2: 393-395. In Barnouw, Erik, ed. 1989. International Encyclopedia of Communications, 4vols. New York: Oxford University Press

Woolard, Kathryn A. 1998“Introduction: language ideology as a field of inquiry”, 3-50. In Schieffelin, Bambi, Woolard, Kathryn A. and Kroskrity, Paul V. 1998. Language Ideologies - Practice and Theory . New York and Oxford: Oxford University Press: 3

Kourdis, E (2004). A sociolinguistic study of evaluation criteria of Modern Greek dialects and regional accents . In proceeding of 2nd International Conference of Modern Greek Dialects and Linguistic Theory ( https://www.researchgate.net/publication/233382556_A_sociolinguistic_study_of_evaluation_criteria_of_Modern_Greek_dialects_and_regional_accents?ev=prf_pub)

Conference Paper A sociolinguistic study of evaluation criteria of Modern Gre...

There is Jennifer Jenkins' "English as a lingua franca: attitude and identity", Oxford University Press (2007). I'm sure it will help.