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Nonfiction Books
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Below are some reference books relating to the Hardy Boys: 
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Ghost of the Hardy Boys by Leslie McFarlane (Methuen, 1976) - autobiography of the first Ghostwriter.
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Hardy and Hardy Investigations by Tony Carpentieri and Paul Mular (Synsine Press, Fourth Edition June 2001) - This is "the" Hardy Boys reference; indexes all printings from 1927 till sometime in the '70s and includes huge amounts of information on paperbacks, TV memorabilia, first printing info, rare editions, etc.
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The Secret of the Hardy Boys: Leslie McFarlane and the Stratemeyer Syndicate (Ohio University Press, 2004) - excellent biography of McFarlane by Marilyn Greenwald.
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The Lost Hardys: A Concordance by Robert Crawford (Synsine Press, Third Printing November 1998) - Robert has compiled a nice reference of people and places (every last one of them!) for 1-38 OT (see "What's OT?").
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The Mysterious Case of Nancy Drew and the Hardy Boys, by Carole Kismarick and Marvin Heiferman (Simon & Schuster, 1998) - A fun, campy romp through American culture, and the HB & ND tag along.
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Who Wrote That? Edward Stratemeyer: Creator of the Hardy Boys and Nancy Drew (Chelsea House, 2004) - simple biography of Stratemeyer, good for beginners.
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The Secret of the Stratemeyer Syndicate by Carol Billman (1986; Publisher Unknown)
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Edward Stratemeyer and the Stratemeyer Syndicate by Deidre Johnson (Date Unknown; Twain Publishers)
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Stratemeyer Pseudonyms and Series Books by Deidre Johnson (Date Unknown; Greenwood Press)
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To locate reference books out of print, you may wish to post a want ad in the Bayport Gazette classifieds, or post on various e-groups.
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