Cita APA (7a ed.)

O'BRIEN, T. SIMPLY GRAMMAR- 3. V-CONNET.

Cita Chicago Style (17a ed.)

O'BRIEN, TERRY. SIMPLY GRAMMAR- 3. NEW DELHI: V-CONNET.

Cita MLA (9a ed.)

O'BRIEN, TERRY. SIMPLY GRAMMAR- 3. V-CONNET.