Cita APA (7a ed.)

Howell, S. (2014). New Treetops: Class book and workbook 3. Oxford.

Cita Chicago Style (17a ed.)

Howell, Sarah. New Treetops: Class Book and Workbook 3. Buenos Aires: Oxford, 2014.

Cita MLA (8a ed.)

Howell, Sarah. New Treetops: Class Book and Workbook 3. Oxford, 2014.