There are many styles to handle references to other books (or websites) in printed media. The style preference also seems to differ between e.g. science and humanities.
In e-books references can be styled in the same way as in printed books, just with a hyperlink below the short-name (or number) of the reference.
For an IT specialist publication planned to be published as printed book and as e-book, I intended to use the same style of references into the bibliography as I'm used from writing papers in computer science:
As you can see in [foobar93], [fnord95] and [example.com], foo and bar …
And then in the bibliography at the end of the book:
[foobar93] Interpretations of Something; Foo, Bar, et al.; 1993; Bla & Co Publishers
[fnord95] Why Something is Wrong; Fnord; 1995; Blubble Pub
[example.com] Example Website; http://www.example.com/
But my publisher was quite unhappy with that style and suggested to use footnotes instead as it would be better for e-books. From my point of view this is just the same, just with smaller hyperlinks to click and more work for the author as he won't have a central bibliography and multiply mentioned references would need to be written multiple times manually:
As you can see in Interpretations of Something¹, Why Something is Wrong² and the Example Website³, foo and bar …
And then usually on the bottom of the same page (science), or at the end of the chapter (humanities):
¹ Interpretations of Something; Foo, Bar, et al.; 1993; Bla & Co Publishers
² Why Something is Wrong; Fnord; 1995; Blubble Pub
³ Example Website; http://www.example.com/
So from my point of view visually bigger tag-like links seem to be better suited for e-books than footnotes in tiny fonts.
If the reference is just a website, a direct link to it (maybe visually marked as external link somehow) would be best for e-books, but is completely unsuitable for printed books.
Should a book which is published in print as well as electronically have the same references style in both types of media?
If so, is there a reference style known to be especially suited for both media?
If not, is there a recommendation how to phrase texts so that references always can be rendered in different styles? (Notice the additional "the" in the second example.)
- Are there implementations of such separate styles for AsciiDoc or Markdown?
Note: When talking about e-books I primarily think of the formats PDF and epub.