APA (7e ed.) Bronvermelding

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

Chicago (17e ed.) Bronvermelding

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

MLA (9e ed.) Bronvermelding

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