Is this a bedbug or book lice?

Is this a bedbug or book lice? I picked up a book and i noticed black marks on the edge and this dead bug or shell attached to it. Ive never had them and I cant tell what it is

Is this a bedbug or book lice? I picked up a book and i noticed black marks on the edge and this dead bug or shell attached to it. Ive never had them and I cant tell what it is