Images

Book covers
Most images originate from the book source itself or alternatively from Pixabay.
Background photos
January: Free-Photos on Pixabay
February: Jo Barnard on Stocksnap.io
March: jpeter2 on Pixabay
April: jpeter2 on Pixabay
May: GeorgSchober on Pixabay
June: acandraja on Pixabay
July: ?
August: ?
September: Micah. H on Unsplash
October: Asa Rodger on Unsplash
November: Ghost Presenter on Stocksnap.io
December: StockSnap on Pixabay

Books

Books are from various sources including:
wikisource.org
storyweaver.org.in
gutenberg.org
feedbooks.com
ebooksgratuits.com
atramenta.net
bibebook.com

Each book shows its license and author(s)