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It is not absolutely required, and if references are to books that simply aren't viewable online there's nothing to hyperlink to. That said, if a given book is online (as many of these historical and/or reference works on India are) it is definitely preferable to hyperlink to the work and page in question. You might want to check GoogleBooks to see if this book (and the proper pages) are viewable. If a public-domain book is viewable at places other than gBooks (Gutenberg, Archive, etc.) those are even better, since the ability to view pages of GoogleBooks varies by country depending on various intellectual property laws. MatthewVanitas (talk) 13:50, 30 September 2011 (UTC)