APA (7th ed.) Zitazioa

THOMSON, A. (1970). A practical English grammar: Exercises 1-6. E.L.B.S.,O.U.P.

Chicago Style (17th ed.) Zitazioa

THOMSON, A.J. A Practical English Grammar: Exercises 1-6. London: E.L.B.S.,O.U.P, 1970.

MLA (9th ed.) Zitazioa

THOMSON, A.J. A Practical English Grammar: Exercises 1-6. E.L.B.S.,O.U.P, 1970.