Re: References appear with

[Alex Vergara Gil]

Do you mean the setting in Documents>  Settings>  Language?
Mine is set to English.

Then select the reference section and check the language, the best 
solution should be to look at the lyx file into a text editor such as 
notepad++ (win2) or gedit (linux) and search for \language, you must 
have declared this only once in the entire document otherwise erase 
every other appearance than the first.