Alexander, L. G. (1971). Practice and progress: Supplementary written exercises. Longman.
Cita Chicago Style (17a ed.)Alexander, L. G. Practice and Progress: Supplementary Written Exercises. London: Longman, 1971.
Cita MLA (9a ed.)Alexander, L. G. Practice and Progress: Supplementary Written Exercises. Longman, 1971.
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