Cita APA (7a ed.)

Eckersley, C. E., & Eckersley, J. M. (1970). Essential English for foreign students: . Book one , [Students Book] (Revised edition 1970 / by J. M. Eckersley.). Longman.

Cita Chicago Style (17a ed.)

Eckersley, C. E., y John Macaulay Eckersley. Essential English for Foreign Students: . Book One , [Students Book]. Revised edition 1970 / by J. M. Eckersley. London: Longman, 1970.

Cita MLA (9a ed.)

Eckersley, C. E., y John Macaulay Eckersley. Essential English for Foreign Students: . Book One , [Students Book]. Revised edition 1970 / by J. M. Eckersley. Longman, 1970.