For interest, you can do something like this on the command line using curl. Try these:
curl -LH "Accept: text/bibliography" "http://dx.doi.org/10.1017/S0022112061000019"
curl -LH "Accept: text/bibliography; style=bibtex" "http://dx.doi.org/10.1017/S0022112061000019"
curl -LH "Accept: text/bibliography; style=apa" "http://dx.doi.org/10.1017/S0022112061000019"
My academic life became a lot simpler when I learnt this - now I only need to maintain a database of {cite key: DOI} pairs, rather than a bibtex monster. Yes, I have tried Mendeley et al. and yes, I do prefer scripts that do what I tell them to.