Cita APA (7a ed.)

Clarke, W., & Mackenzie, M. (1964). Modern english practice: Exercises in english for foreign students. Longmans.

Cita Chicago Style (17a ed.)

Clarke, Waldo, y Munro Mackenzie. Modern English Practice: Exercises in English for Foreign Students. London: Longmans, 1964.

Cita MLA (8a ed.)

Clarke, Waldo, y Munro Mackenzie. Modern English Practice: Exercises in English for Foreign Students. Longmans, 1964.