You're kidding right?  You think every reference in Wikipedia needs to be a web based source so you can check it?  From WP:CITE   "The citation should state, as clearly, fully, and precisely as possible, how a reader can find the source material, such as by external link to the source website. If the material is not findable online, it should be findable in reputable libraries, archives, or collections. If a citation without an external link is challenged as unfindable, any of the following is sufficient to show the material to be reasonably findable (though not necessarily reliable): providing an ISBN or OCLC number; linking to an established Wikipedia article about the source (the work, its author, or its publisher); or directly quoting the material on the talk page, briefly and in context.""