Cita APA (7a ed.)

Baeza, L. d., & Manárriz, C. Brush up your Spanish. Linguaphone Institute.

Cita Chicago Style (17a ed.)

Baeza, L. de, y Carmen Manárriz. Brush Up Your Spanish. London: Linguaphone Institute.

Cita MLA (9a ed.)

Baeza, L. de, y Carmen Manárriz. Brush Up Your Spanish. Linguaphone Institute.