APA (7th ed.) Zitazioa
Shaw, K. (1991). English grammar exercises. CollinsELT.
Chicago Style (17th ed.) Zitazioa
Shaw, Katy. English Grammar Exercises. Grear Britain: CollinsELT, 1991.
MLA (9th ed.) Zitazioa
Shaw, Katy. English Grammar Exercises. CollinsELT, 1991.
Kontuz: berrikusi erreferentzia hauek erabili aurretik.