Cita APA (7a ed.)

Eckersley, C. E., Eckersley, J. M., & Beard, A. E. (1972). Essential English for foreign students (Rev. ed., new impression.). Longman.

Cita Chicago Style (17a ed.)

Eckersley, C. E., J. M. Eckersley, y A. E. Beard. Essential English for Foreign Students. Rev. ed., new impression. London: Longman, 1972.

Cita MLA (9a ed.)

Eckersley, C. E., et al. Essential English for Foreign Students. Rev. ed., new impression. Longman, 1972.