Is the shelf depth 240mm enough?
If it's only a small shelf in the bedroom, the bookshelf is a little smaller
Generally a piece of A4 paper width is 21cm, which is 210mm, our common book specifications basically width is less than the width of the A4 paper, so the depth of 240mm shelves should be put under the most books, occasionally there are special open big books, can not put on the shelf, no what effect.
The shelf depth 240mm should be enough.