APA (7th ed.) Citation

Howard, G. (1994). The good English guide: English usage in the 1990s. Macmillan Reference Books.

Chicago Style (17th ed.) Citation

Howard, Godfrey. The Good English Guide: English Usage in the 1990s. London: Macmillan Reference Books, 1994.

MLA (9th ed.) Citation

Howard, Godfrey. The Good English Guide: English Usage in the 1990s. Macmillan Reference Books, 1994.