Cita APA (7a ed.)

Eckersley, C. E., & Eckersley, J. M. (1971). Essential English for foreign students: . Book two , [Students' book] (Rev. ed. 1971 / by J. M. Eckersley.). Longman.

Cita Chicago Style (17a ed.)

Eckersley, C. E., y John Macaulay Eckersley. Essential English for Foreign Students: . Book Two , [Students' Book]. Rev. ed. 1971 / by J. M. Eckersley. London: Longman, 1971.

Cita MLA (9a ed.)

Eckersley, C. E., y John Macaulay Eckersley. Essential English for Foreign Students: . Book Two , [Students' Book]. Rev. ed. 1971 / by J. M. Eckersley. Longman, 1971.