Cita APA (7th ed.)

Ward, J. M. (1976). Practice in structure and usage: Fifty exercises. Longman.

Cita Chicago (17th ed.)

Ward, John Millington. Practice in Structure and Usage: Fifty Exercises. Londres: Longman, 1976.

Cita MLA (9th ed.)

Ward, John Millington. Practice in Structure and Usage: Fifty Exercises. Longman, 1976.