APA (7th ed.) Zitazioa

Eckersley, C. (1963). Essential english for foreign students: Book four: teacher's book. Longman Group.

Chicago Style (17th ed.) Zitazioa

Eckersley, C.E. Essential English for Foreign Students: Book Four: Teacher's Book. London: Longman Group, 1963.

MLA (9th ed.) Zitazioa

Eckersley, C.E. Essential English for Foreign Students: Book Four: Teacher's Book. Longman Group, 1963.