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Here's my favored method for citing journal articles:
1) When the original source is open-access, I try to make the title of the paper into a link to that source, e.g.:
2) When the original source is not-open access, I try to make the journal title into a link to the original source, but the paper title into a link to any source that happens to be available, e.g.:
The point of this system is that:
if the paper title is underlined you can click on it and get the paper for free (unless the link has broken in the meantime)
if the paper title is not underlined it means you probably can't get the paper for free (unless someone has made it available in the meantime)
you can always see a reference to the original source.
In case 2, sometimes I get lazy and don't include a link to the original source, e.g.:
This is not ideal, but there is still enough information to quickly find a link to the original source using Google. I encourage people (including myself) to improve such entries by bringing up to the standard described in 2. This is something that anyone can do whenever they have a bit of spare time.
The goal here is to make information quickly accessible to everyone while still preserving good scholarship.