Cita APA (7th ed.)

Burke, K., & Brooks, J. (1999). Wavelength: Elementary coursebook. Pearson Education.

Cita Chicago (17th ed.)

Burke, Kathy, i Julia Brooks. Wavelength: Elementary Coursebook. Essex: Pearson Education, 1999.

Cita MLA (9th ed.)

Burke, Kathy, i Julia Brooks. Wavelength: Elementary Coursebook. Pearson Education, 1999.