Cita APA (7a ed.)

Eckersley, C. E., & Eckersley, J. M. (1973). A comprehensive english grammar: For foreign students. Longman.

Cita Chicago Style (17a ed.)

Eckersley, C. E., y J. M. Eckersley. A Comprehensive English Grammar: For Foreign Students. London: Longman, 1973.

Cita MLA (8a ed.)

Eckersley, C. E., y J. M. Eckersley. A Comprehensive English Grammar: For Foreign Students. Longman, 1973.