Cita APA (7th ed.)
Shaw, K. (1991). English grammar exercises. CollinsELT.
Cita Chicago (17th ed.)
Shaw, Katy. English Grammar Exercises. Grear Britain: CollinsELT, 1991.
Cita MLA (9th ed.)
Shaw, Katy. English Grammar Exercises. CollinsELT, 1991.
Atenció: Aquestes cites poden no estar 100% correctes.