APA (7th ed.) Citation

O'Donnell, W. R., & Todd, L. (1980). Variety in contemporary English. Allen & Unwin.

Chicago Style (17th ed.) Citation

O'Donnell, W. R., and Loreto Todd. Variety in Contemporary English. London: Allen & Unwin, 1980.

MLA (9th ed.) Citation

O'Donnell, W. R., and Loreto Todd. Variety in Contemporary English. Allen & Unwin, 1980.

Warning: These citations may not always be 100% accurate.