Cita APA (7th ed.)

Eckersley, C. E. (1942). Essential English (2a. ed.). Longmans Green.

Cita Chicago (17th ed.)

Eckersley, C. E. Essential English. 2a. ed. Londres: Longmans Green, 1942.

Cita MLA (9th ed.)

Eckersley, C. E. Essential English. 2a. ed. Longmans Green, 1942.