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