Cita APA (7a ed.)

Eckersley, C. E., & Salisbury, C. S. (1956). Essential English for foreing students: Book 3.

Cita Chicago Style (17a ed.)

Eckersley, C. E., y Charles Sharrocks Salisbury. Essential English for Foreing Students: Book 3. London, 1956.

Cita MLA (9a ed.)

Eckersley, C. E., y Charles Sharrocks Salisbury. Essential English for Foreing Students: Book 3. 1956.