Citazione Stile APA (7a Edizione)

SUMMERFIELD, G. e. (1971). English in practice secondary English departments: At work ed. C.U.P.

Citazione stile Chigago Style (17a edizione)

SUMMERFIELD, Geoffrey ed. English in Practice Secondary English Departments: At Work Ed. London: C.U.P, 1971.

Citatione MLA (9a ed.)

SUMMERFIELD, Geoffrey ed. English in Practice Secondary English Departments: At Work Ed. C.U.P, 1971.