APA (7th ed.) Zitazioa

Tregidgo, P. S. (1979). English grammar in practice. Longman.

Chicago Style (17th ed.) Zitazioa

Tregidgo, P. S. English Grammar in Practice. Harlow: Longman, 1979.

MLA (9th ed.) Zitazioa

Tregidgo, P. S. English Grammar in Practice. Longman, 1979.