Cita APA (7a ed.)

O'Donnell, W. R., & Todd, L. (1995). Variety in contemporary English (2nd ed.). Routledge.

Cita Chicago Style (17a ed.)

O'Donnell, W. R., y Loreto Todd. Variety in Contemporary English. 2nd ed. London [etc.]: Routledge, 1995.

Cita MLA (9a ed.)

O'Donnell, W. R., y Loreto Todd. Variety in Contemporary English. 2nd ed. Routledge, 1995.