Cita APA (7th ed.)

Aish, F., & Tomlinson, J. (2012). Collins grammar for IELTS. Collins.

Cita Chicago (17th ed.)

Aish, Fiona, i Jo Tomlinson. Collins Grammar for IELTS. London: Collins, 2012.

Cita MLA (9th ed.)

Aish, Fiona, i Jo Tomlinson. Collins Grammar for IELTS. Collins, 2012.