English Language Services. (1966). Special english: Engineering. Collier Macmillan International.
Citazione stile Chigago Style (17a edizione)English Language Services. Special English: Engineering. Nueva York: Collier Macmillan International, 1966.
Citatione MLA (9a ed.)English Language Services. Special English: Engineering. Collier Macmillan International, 1966.
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