Cassidy, Frederic G., ed.Dictionary of American Regional English. Belknap, 1986. Survey of spoken American English; includes thousands of unique dialect variations and more than 500 maps.
McCrum, Robert.The Story of English. Penguin, 1992. An international perspective on the spread of the English language, based on an acclaimed PBS series.
Baugh, Albert C., and Thomas Cable.A History of the English Language. 5th ed. Pearson, 2001. Authoritative textbook discussion of the origins and developments of the English language.
Burnley, David D.The History of the English Language. 2nd ed. Addison Wesley Longman, 2000. Both a concise history and catalogue with textual examples from different periods.
Crystal, David.English as a Global Language. 2nd ed. Cambridge University Press, 2003. Examines how English has become the world's dominant language.
Kacirk, Jeffrey.Forgotten English. Morrow, 1997, 1999. History of archaic English words.
McCrum, Robert; William Cran; and Robert MacNeil.The Story of English. 3rd ed. Penguin, 2002. An international perspective on the spread of the English language, based on an acclaimed PBS series.
Cleary, Brian.A Mink, a Fink, a Skating Rink: What Is a Noun? Lerner, 2000. For readers in grades 2 to 4. Part of a series called Words Are Categorical, including To Root, to Toot, to Parachute: What is a Verb? and Hairy, Scary, Ordinary: What is an Adjective?
Fowler, H. W.Ed. R. W. Burchfield.The New Fowler's Modern English Usage. Oxford University Press, 1996. Indispensable primary source on grammar, pronunciation, and spelling; includes comparisons between British and American English.
Cassidy, Frederic G., ed.Dictionary of American Regional English. Belknap, 1986. Survey of spoken American English; includes thousands of unique dialect variations and more than 500 maps.
Chapman, Robert L.American Slang. HarperPerennial, 1987. Abridged edition of the New Dictionary of American Slang (Harper, 1986).