Cita APA (7th ed.)

Eckersley, C. E. (1950). A modern english course for foreign students an intermediate book. Longmans Green.

Cita Chicago (17th ed.)

Eckersley, C. E. A Modern English Course for Foreign Students an Intermediate Book. Londres: Longmans Green, 1950.

Cita MLA (9th ed.)

Eckersley, C. E. A Modern English Course for Foreign Students an Intermediate Book. Longmans Green, 1950.