Cita APA (7th ed.)

Burke, K., & Brooks, J. (2000). Wavelength: Pre-intermediate coursebook. Pearson Education.

Cita Chicago (17th ed.)

Burke, Kathy, i Julia Brooks. Wavelength: Pre-intermediate Coursebook. Essex: Pearson Education, 2000.

Cita MLA (9th ed.)

Burke, Kathy, i Julia Brooks. Wavelength: Pre-intermediate Coursebook. Pearson Education, 2000.