I've never used Books or Newsstand, and I'm continually running out of space. Is there a way to just delete these apps?
Android 4.1.2 Kernel 3.0.31-889555
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Since Android 4.0, it is possible to "disable" apps without root. However, not all apps can be "disabled": some (pre-installed) system-apps are protected against this. Still, it's always worth a try if you don't want to root your device:
These actions are reversible: You can always re-visit the apps entries here, and push the button again (it will be labeled "Enable" then).
If you could not deactivate an app this way, all that's left is root and some "Bloatware remover", as indicated by Lucas' answer. Apart from Titanium Backup, there are several other "root-apps" which can do that – though Titanium is a great choice, as it also provides the means to do full backups and more. If chosing this path, make sure to freeze apps first to check for side-effects: As with above steps, a "freeze" is revertible – a "remove" is not (at least not easily).