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The URL could change at any given time without notice.Also, you are assuming that everyone is reading your paper electronically and has access to the internet.
What you need (at minimum): Because URL are (usually) not eternal, but hopefully your publication is, then I wouldn't advise to only put an URL, especially for books or paper.
It doesn't add much to make a full biblio item, that can of course include the URL! For example if you are citing books.google.* , then you need to cite that book as a book and not a URL.
The URL allows people to find an e-copy, at least for a while.
The conventional references do not necessarily produce copies accessible through the internet, though sometimes they do.
Books and articles are not the only subjects, sometimes you may be asked to write a critical analysis of a movie, a painting, or any other work of art.
You need to analyze an author’s rhetorical methods and the overall effectiveness of the piece.
Second, physical references are equally transient, if in a different way...
usually that many different libraries throughout the world maintain "cached" copies.
The point of a bibliography is not only to identify your sources, but to allow your readers to read those sources themselves, at some indefinite time in the future.
Bare URLs rarely serve that function, in part because URLs are (by design) transient, and in part because you cannot assume that your unknown future reader will have internet access.