The easiest way is to go to: http://suttacentral.net/
SN IV 217
in the box, check "Volume/Page reference", and click "Submit".
In this case, you'll be pointed to several translations. For some suttas there are no on-line translations, but you will at least get the SN 36.11 form of reference.
There is some more discussion at: http://suttacentral.net/help.php
That site was set up to allow easy correspondence between Suttas from different schools, so there is some extra discussion that is not so relevant for this purpose.