Cleo,

Alguns estudos que eu conheço:

Ammon, Ulrich. The Dominance of English as a Language of Science. Walter de Gruyter, 2001
Crystal, David. English as a Global Language. Cambridge, UK: Cambridge University Press, 1997
Crystal, David. The Cambridge Encyclopedia of the English Language. Cambridge, UK: Cambridge University Press, 1999
Crystal, David. The Cambridge Encyclopedia of Language. Cambridge, UK: Cambridge University Press, 1997