They're completely different from books in this context. A newspaper is usually read within hours from its print; a magazine within days; a book might require s

They're completely different from books in this context. A newspaper is usually read within hours from its print; a magazine within days; a book might require six months or six years to be read. Nobody except maybe the same publishing company and a few other businesses would have use for ad space that would require so much time to be seen.