The different versions of the series spell the title differently−thus Hitch-Hiker's Guide, Hitch Hiker's Guide and Hitchhiker's Guide are used in different editions (US or UK), formats (audio or print) and compilations of the book. Some editions used different spellings on the spine and title page. The h2g2's English Usage in Approved Entries claims that Hitchhiker's Guide is the spelling Adams preferred. At least two reference works make note of the inconsistency in the titles. Both, however, repeat the statement that Adams decided in 2000 that "everyone should spell it the same way [one word, no hyphen] from then on."
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