Cita APA (7th ed.)

Vas, G. (2006). Grammar matters: Common errors in English. Sterling.

Cita Chicago (17th ed.)

Vas, Gratian. Grammar Matters: Common Errors in English. New Delhi: Sterling, 2006.

Cita MLA (9th ed.)

Vas, Gratian. Grammar Matters: Common Errors in English. Sterling, 2006.