Special:Book doesn't know about books. I know it's absurd, but
Wikipedia. https://phabricator.wikimedia.org/T28448
Because $reason, what you ask is actually being done separately, as
https://meta.wikimedia.org/wiki/Book_management . Getting an extension
enabled for Wikibooks or Wikisource is a practically impossible task. If
you could start using the experimental
https://www.mediawiki.org/wiki/Extension:BookManagerv2 and report back
on your experience with it, I'm sure that the development progress would
get much faster.
Nemo
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