http://definitivedrupal.org/admin/structure/types/add
Give it a name, Resource. The machine name is just fine as it is, resource. Give it a description, A reference page or other resource for the Definitive Guide to Drupal 7. Connects to a book chapter.

Set the default publishing options to published and create new revision.

There's no reason to have any menus available on Menu settings, we'll be making links to these resources from their respective chapters.

@TODO checkmark to use the submit again button in whatever way the Add Another module does it.

Comments can stay enabled and other settings as default also.