https://doi.org/xxxxx
A DOI (Digital Object Identifier) is a series of numbers used to identify ebooks and journal articles. Many online resources will possess their own unique DOI. The DOI of an eBook can often be found on the details page of the resource or on the front page of an article. If you can't find the DOI use the following free online tool to look it up: https://search.crossref.org/
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DOIs must take the format https://doi.org/xxxxx (do not add a full stop after it, e.g. https://doi.org/10.12964/jsst.19005)
Please note that some sites use dashes to formulate the DOI. It is okay to use this format providing the link works e.g. https://doi-org/xxxxx
If available, always add a DOI to the end of print or online resources in your reference lists.
Always add DOIs to sources from academic databases. Never use URLs for these resources.
https://xxxxx
URL (Uniform Resource Locator) is a reference (an address) to a resource on the Internet. Urls should link directly to the source being cited and can be found in the address bar of your internet browser.
For websites (not including academic research databases), which don't have DOIs, provide a URL in the reference.
If a URL is broken, do not include it in the reference. Copy and paste live URLs to references (do not add a full stop after them).