Cita APA (7a ed.)

Clarke, D. W., & Mackenzie, M. D. M. (1971). Modern English practice: Exercises in English for foreign students (1st published, new impression, september.). Longman.

Cita Chicago Style (17a ed.)

Clarke, David Waldo, y M. D. Munro Mackenzie. Modern English Practice: Exercises in English for Foreign Students. 1st published, new impression, september. London: Longman, 1971.

Cita MLA (9a ed.)

Clarke, David Waldo, y M. D. Munro Mackenzie. Modern English Practice: Exercises in English for Foreign Students. 1st published, new impression, september. Longman, 1971.