Within the closed class, there are articles, which in English, always accompany a noun. An article that is indefinite indicates that the noun that the article is accompanying is a non specific noun that cannot be set apart from nouns with the same name. For example in the sentence: "The girl got a doll", a is not specifying any particular doll, but the is specifying a particular girl.
- Crystal, David. (1997) A Dictionary of Linguistics and Phonetics. Oxford, UK: Blackwell.
- Matthews, P. H. (1997) The Concise Oxford Dictionary of Linguistics. Oxford: Oxford University Press..