Cita APA (7a ed.)

Radley, P., & Millerchip, C. (1991). Mode 1. Workbook. Collins E.L.T.

Cita Chicago Style (17a ed.)

Radley, Paul, y Chris Millerchip. Mode 1. Workbook. Londres: Collins E.L.T, 1991.

Cita MLA (9a ed.)

Radley, Paul, y Chris Millerchip. Mode 1. Workbook. Collins E.L.T, 1991.