APA (7th ed.) Zitazioa

ETHERTON, A. (1963). A graded secondary school english course. Longman.

Chicago Style (17th ed.) Zitazioa

ETHERTON, A.R.B. A Graded Secondary School English Course. London: Longman, 1963.

MLA (9th ed.) Zitazioa

ETHERTON, A.R.B. A Graded Secondary School English Course. Longman, 1963.