Cita APA (7a ed.)

Laporta, E. (1989). A Practical english course: Third stage - 3rd. Nacional IBEP.

Cita Chicago Style (17a ed.)

Laporta, Edgar. A Practical English Course: Third Stage - 3rd. São Paulo, SP: Nacional IBEP, 1989.

Cita MLA (9a ed.)

Laporta, Edgar. A Practical English Course: Third Stage - 3rd. Nacional IBEP, 1989.