APA (7th ed.) Citation

Howard, P. (1984). The state of the language: English observed. Penguin books.

Chicago Style (17th ed.) Citation

Howard, Philip. The State of the Language: English Observed. New York [etc.]: Penguin books, 1984.

MLA (9th ed.) Citation

Howard, Philip. The State of the Language: English Observed. Penguin books, 1984.