I use the LaTeX wikibook a lot and found this solution to preserving capitalization in titles, which is to wrap letters (or whole titles) in curly braces. The phrase "In the event that BibTeX has been set to not preserve all capitalization within titles" suggests that I can fix this with a setting, instead of going back into my .bib files and wrapping titles in {}. Is this true?
FWIW, I use natbib and cite mostly journal articles, which tend to have full capitalization except for articles. Thanks!