Cita APA (7a ed.)

Roderick, M., Nuttall, C., & Kenny, N. (2013). Proficiency expert. Pearson Education.

Cita Chicago Style (17a ed.)

Roderick, Megan, Carol Nuttall, y Nick Kenny. Proficiency Expert. Harlow (Essex): Pearson Education, 2013.

Cita MLA (9a ed.)

Roderick, Megan, et al. Proficiency Expert. Pearson Education, 2013.