Carr, Philip. 1999. English Phonetics and Phonology. Malden: Blackwell Publishing.

Fischer, Olga & Wim van der Wurff. 2006. Syntax. In A History of the English Language, R. Hogg & D. Denison (eds), 109-198. Cambridge: Cambridge University Press.

Giegerich, Heinz. 1992. English Phonology: An Introduction. Cambridge: Cambridge University Press.

Greenbaum, Sidney & Randolph Quirk. 1990. A Student’s Grammar of the English Language. Essex: Longman.

Hammond, Michael. 1999. The Phonology of English: A Prosodic Optimality-Theoretic Approach. Oxford: Oxford University Press.

Harley, Heidi. 2006. English Words: A Linguistic Introduction. Malden: Blackwell Publishing.

Jespersen, Otto. 1917. Negation in English and Other Languages. Copenhagen: A.F. Host.

Minkova, Donka & Robert Stockwell. 2008. Phonology: Segmental Histories. In A Companion to the History of the English Language, H. Momma and M. Matto (eds), 29-42. Malden, MA: Blackwell Publishing.

Potsdam, Eric. 1997. NegP and Subjunctive Complements in English. Linguistic Inquiry 28: 533-541.

Santorini, Beatrice & Anthony Kroch. 2007-. The Syntax of Natural Language: An Online Introduction Using the Trees Program. Available at: http://www.ling.upenn.edu/~beatrice/syntax-textbook

Zwicky, Arnold & Geoffrey Pullum. 1983. Cliticization vs. inflection: English n’t. Language 59: 502-513.