Sorry for the slow reply. I’m not sure what a proper EndNote reference is supposed to be, but from your example, it looks like your link should lead to a WP page that uses a custom template to deliver the required content as plain text. The link to this page could include the relevant post or page ID as an URL parameter, which tells the page template code where to get the data that it should send out.
A possible variant would be the link merely launches a modal that contains the plain text EndNote content. These modals would be part of your page’s regular content, but hidden by CSS. JS would alter CSS to expose the content, then hide it again when OK or X is clicked.
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