Eckersley, C. E., & Eckersley, J. M. (1972). Essential English for foreign students: [Students' book] . Book one (New impression.). Longman.
Cita Chicago Style (17a ed.)Eckersley, C. E., y John Macaulay Eckersley. Essential English for Foreign Students: [Students' Book] . Book One. New impression. London: Longman, 1972.
Cita MLA (9a ed.)Eckersley, C. E., y John Macaulay Eckersley. Essential English for Foreign Students: [Students' Book] . Book One. New impression. Longman, 1972.
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