Cambridge Encyclopedia of the English Language
Handbook of English Linguistics
International Encyclopedia of Linguistics
The Linguistics Encyclopedia
Slang and Sociability
Slang! : the topical dictionary of Americanisms
Juba to jive : a dictionary of African-American slang
The American Heritage dictionary of idioms
Encyclopedia of Bilingual Education
Encyclopedia of Swearing
How Not to Say What You Mean: a dictionary of euphemisms
The Facts on File Dictionary of Clichés
The Cambridge Guide to English Usage
Garner's Modern American Usage
The African Heritage of American English
British English for American readers : a dictionary of the language, customs, and places of British life and literature
Ethnologue : languages of the world
The Atlas of North American English: Phonetics, Phonology and Sound Change
Continuum Companion to Historical Linguistics by 
Facts on File Encyclopedia of Word and Phrase Origins
Word origins-- and how we know them : etymology for everyone
The secret life of words : how English became English