APA (7th ed.) Zitazioa

Drummond, G. (1972). English structure practice. Longman.

Chicago Style (17th ed.) Zitazioa

Drummond, Gordon. English Structure Practice. London: Longman, 1972.

MLA (9th ed.) Zitazioa

Drummond, Gordon. English Structure Practice. Longman, 1972.