Cita APA (7a ed.)

Laporta, E. (1990). A Practical english course: Workbook. Nacional IBEP.

Cita Chicago Style (17a ed.)

Laporta, Edgar. A Practical English Course: Workbook. São Paulo, SP: Nacional IBEP, 1990.

Cita MLA (9a ed.)

Laporta, Edgar. A Practical English Course: Workbook. Nacional IBEP, 1990.