Cita APA (7th ed.)

ECKERSLEY, C. (1970). Essential English for foreign students: ECKERSLEY, C.E. Longman.

Cita Chicago (17th ed.)

ECKERSLEY, C.E. Essential English for Foreign Students: ECKERSLEY, C.E. London: Longman, 1970.

Cita MLA (9th ed.)

ECKERSLEY, C.E. Essential English for Foreign Students: ECKERSLEY, C.E. Longman, 1970.