He also published two introductory books to linguistics: "Language: The basics" (1995) and "Introducing Linguistics" (coauthored with Bill Mayblin) (2000), and several dictionaries on different topics of this science: "A dictionary of grammatical terms in linguistics" (1993), "A dictionary of phonetics and phonology" (1996), "A student's dictionary of language and linguistics" (1997), "Key concepts in language and linguistics" (1999), "The dictionary of historical and comparative linguistics" (2000) and "The Penguin dictionary of English grammar" (2000).