Cita APA (7th ed.)

O'BRIEN, T. SIMPLY GRAMMAR- 7. V-CONNET.

Cita Chicago (17th ed.)

O'BRIEN, TERRY. SIMPLY GRAMMAR- 7. NEW DELHI: V-CONNET.

Cita MLA (9th ed.)

O'BRIEN, TERRY. SIMPLY GRAMMAR- 7. V-CONNET.