APA (7th ed.) Zitazioa

Eckersley, C. (1964). A commercial course for foreign students™. Longman.

Chicago Style (17th ed.) Zitazioa

Eckersley, C.E. A Commercial Course for Foreign Students™. London: Longman, 1964.

MLA (9th ed.) Zitazioa

Eckersley, C.E. A Commercial Course for Foreign Students™. Longman, 1964.