Additional Books and Repertories may be purchased and there is a very long list.
Sometimes the best strategy is simply to upgrade your whole library or libraries, however sometimes that means you must upgrade your application too as some books and repertories require features that only the newest applications have. This is especially true for the latest version of the Complete Repertory vis 2009, because it contains new remedies, which have only been added to MacRepertory 8.
You may of course just and one or two books or repertories.
In the case of ReferenceWorks, if you wish to have library G3, you must also upgrade your ReferenceWorks application.
Because of this, the upgrade quote always includes the application. So for example; if you have ReferenceWorks 3 Classic with Library F, the you will be given a quote for the upgrade to ReferenceWorks 4 Classic with library G3. You could at that time choose to upgrade to ReferenceWorks 4 Pro with Library G3 and that would cost more.
Often when you purchase a book, it will be for both MacRepertory and ReferenceWorks. Sometimes it will be for only one of them.
Please ask for a quote or call your KHA rep.