Citazione Stile APA (7a Edizione)

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

Citazione stile Chigago Style (17a edizione)

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

Citatione MLA (9a ed.)

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