APA (7th ed.) Zitazioa

CHRISTOPHERSEN, P. (1969). An advanced english grammar. Macmillan.

Chicago Style (17th ed.) Zitazioa

CHRISTOPHERSEN, Paul. An Advanced English Grammar. London: Macmillan, 1969.

MLA (9th ed.) Zitazioa

CHRISTOPHERSEN, Paul. An Advanced English Grammar. Macmillan, 1969.