Footnotes, endnotes or online notes?

[Eva Elisabeth]

The genuine is what I'm interested in. And paper doesn't blush, so without sources - how do you know you can rely and are not reading the tales of Wonderland? Or as RR frequently said (e.g. when signing the INF treaty on Dec. 8, 1987):
http://m.youtube.com/watch?v=As6y5eI01XE
(Actually AFAIK the original quote is by Lenin.)

As for the manner: of course it's nice to have them in the book (and I couldn't say whether I prefer foot- or endnotes as there are pros and cons for both), but the more background info the better, and online notes have capacity to provide the most. (Though it's a pity you can't highlight there.)