Cita APA (7a ed.)

Phillips, T., & Phillips, A. (1996). Impact: Workbook. MacMillan Education LTD.

Cita Chicago Style (17a ed.)

Phillips, Terry, y Anna Phillips. Impact: Workbook. São Paulo, SP: MacMillan Education LTD, 1996.

Cita MLA (9a ed.)

Phillips, Terry, y Anna Phillips. Impact: Workbook. MacMillan Education LTD, 1996.