[R] the making of _R_ eBooks

[Dr. Wolfgang Lindner]

Dear list members,

I like the look and feel of the eBook versions of the R manuals very much.
So I would like to generate eBooks (teaching material etc) in that look.

Q1: is there a description how the _R_ ebooks have been produced?
Q2: which (free) software was used for them?
Q3: any other recommendations?

Seaching the internet gives me e.g.
[1] 
https://sites.google.com/site/richardbyrnepdsite/ebooks-and-audiobooks/create-your-own-ebooks
[2]  opensource.com/life/13/8/how-create-ebook-open-source-way
[3] 
http://scottnesbitt.net/ubuntublog/creating-a-ebook-with-libreoffice-writer/

but I m not sure, if there are better possibilities..

Thanks for any hint or link by expert R users.

Wolfgang Lindner
Leichlingen, Germany