Tregidgo, P. S. (1979). English grammar in practice. Longman.
Tohutoru Kātū Chicago (17th ed.)Tregidgo, P. S. English Grammar in Practice. Harlow: Longman, 1979.
Tohutoro MLA (9th ed.)Tregidgo, P. S. English Grammar in Practice. Longman, 1979.
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