Is there a reason that those references need to be links?
The point of references and citations in respect to authority, copywrite and plagiarism is to 1) let your reader know that you aren't just making things up and letting them know how they can find the source material you referenced, and 2) give credit to the original author of the information you're using. Those are the primary reasons for needing to cite your sources, but that doesn't mean the citations need to be formatted as links.
I don't know if everyone will agree with this, but, aside from any SEO benefit or detriment, the only thing a hyperlink to an external source is good for is to offer your traffic a reason and easy method to leave your site.
The only reasons I can see for linking to any reference, actually the only reason for any kind of link is 1) the reference is another one of your own pages or websites that you want to pass link juice to or one that you want the traffic to visit, 2) the site you're linking to has such high authority that you'll gain some SEO benefit from having an outbound link to it, or 3) the original source has some requirement or agreement for you to include a link to them (in which case a no-follow link would be best for you). If none of those apply then I would just provide the minimum info required for a citation and not make it a link, if possible I wouldn't even use a non linked web address format in the text.
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:ranger: Actually, do you even need the references at all? For authoritive and scholarly work citations are an absolute requirement, but for more casual writing it isn't nearly as important.