APA (7th ed.) Citation

Platt, J. T., Weber, H., & Lian, H. M. (1984). The new Englishes: What are they? Routledge & Kegan Paul.

Chicago Style (17th ed.) Citation

Platt, John Talbot, Heidi Weber, and Ho Mian Lian. The New Englishes: What Are They? London: Routledge & Kegan Paul, 1984.

MLA (9th ed.) Citation

Platt, John Talbot, et al. The New Englishes: What Are They? Routledge & Kegan Paul, 1984.