APA (7th ed.) Citation

English Language Services. (1968). A practical english grammar. Collier Macmillan International.

Chicago Style (17th ed.) Citation

English Language Services. A Practical English Grammar. Nueva York: Collier Macmillan International, 1968.

MLA (9th ed.) Citation

English Language Services. A Practical English Grammar. Collier Macmillan International, 1968.

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