There are many ways of making miniature books, and it depends on what you want them for. You can make a proper book, with folded paper, cover, spine, endpapers, and you can have real text and pictures or just blank pages. Or you can make books to put in you book case with pretty spines. Or you can make mock fronts. Or mock books with nice covers. For my first book case I simply wanted loads of books, and since it is a nineteenth-century house they would all be leather-bound with golden print. So this is how I made them.
For Oxford English Dictionary I used a different technique. I cut the whole row of spines from a book catalogue and pasted on card with flaps on both sides, the depth of the bookcase. So there is actually nothing behind the front. Then I made one book with a cover, to create an effect.
There are magical signs on the spines of leather-bound books because the owner is a magician.