British or American English? : A Handbook of Word and Grammar Patterns by 
The Cambridge Encyclopedia of the English Language by 
The Cambridge Handbook of English Corpus Linguistics by 
The Cambridge History of the English Language: Volume 1, the Beginnings To 1066 by 
The Cambridge History of the English Language: Volume 2, 1066-1476 by 
The Cambridge History of the English Language: Volume 3, 1476-1776 by 
The Cambridge History of the English Language: Volume 4, 1776-1997 by 
The Cambridge History of the English Language: Volume 5, English in Britain and Overseas: Origins and Development by 
The Cambridge History of the English Language: Volume 6, English in North America by 
The New Partridge Dictionary Of Slang And Unconventional English by Dictionaries and glossaries are very helpful for understanding the specialized terms in your field.
Encyclopedias have foundational articles written by authorities in the field and are a good place to start your research.
The Cambridge Encyclopedia of Language by 
The Cambridge Encyclopedia of the World's Ancient Languages by 
Facts about the World's Languages : An Encyclopedia of the World's Major Languages, Past and Present by 
The Atlas of Languages by 
Handbook of the International Phonetic Association by 
Phonetic Symbol Guide by 
The Routledge Handbook of Language and Intercultural Communication by 
The Routledge Handbook of Pidgin and Creole Languages by 
The Routledge Handbook of Second Language Acquisition and Corpora by 
The Routledge Handbook of Second Language Acquisition and Language Testing by 
The Routledge Handbook of Second Language Acquisition and Sociolinguistics by 
The Routledge Handbook of Second Language Acquisition and Speaking by 
The Routledge Handbook of Second Language Acquisition and Technology by 
The Routledge Handbook of Second Language Acquisition and Writing by Dictionaries are very helpful for understanding the specialized terms in your field.
The Encyclopedic Dictionary of Applied Linguistics : A Handbook for Language Teaching by 
Longman Dictionary of Language Teaching and Applied Linguistics by Encyclopedias have foundational articles written by authorities in the field and are a good place to start your research.
Encyclopedia of Language and Education : Research Methods in Language and Education by 
Routledge Encyclopedia of Language Teaching and Learning by 
Handbook of Research on Integrating Technology into Contemporary Language Learning and Teaching by 
Handbook of Research on Teaching the English Language Arts by 
The Handbook of Technology and Second Language Teaching and Learning by 
International Handbook of English Language Teaching by 
The Routledge Handbook of Language Testing by 
The Routledge Handbook of Materials Development for Language Teaching by The Routledge Handbook of Second Language Acquisition and Language Testing by 
Encyclopedia of Communication Theory by 
Encyclopedia of Bilingual Education ( 2 vol. eBook set) by 
