Bibtex capital letters

Edit your bibtex file and use {} for words that you want to keep the style.

@article{greenwade93,        

   author  = "George D. Greenwade",        

   title   = "The {C}omprehensive {T}ex {A}rchive {N}etwork ({CTAN})",        

   year    = "1993",        

   journal = "TUGBoat",        

   volume  = "14",     

   number  = "3",     

   pages   = "342--351" 

}

source: http://www.andy-roberts.net/misc/latex/latextutorial3.html