Cita APA (7a ed.)

Terry, M., & Wilson, J. (2010). Focus on academic skills for IELTS. Pearson Education.

Cita Chicago Style (17a ed.)

Terry, Morgan, y Judith Wilson. Focus on Academic Skills for IELTS. Harlow: Pearson Education, 2010.

Cita MLA (9a ed.)

Terry, Morgan, y Judith Wilson. Focus on Academic Skills for IELTS. Pearson Education, 2010.