Cita APA (7a ed.)

Sweetman, J., & Hubbard, S. M. (1995). English solutions.

Cita Chicago Style (17a ed.)

Sweetman, Jim, y Shelagh Mannion Hubbard. English Solutions. Harlow, 1995.

Cita MLA (9a ed.)

Sweetman, Jim, y Shelagh Mannion Hubbard. English Solutions. 1995.