Cita APA (7a ed.)

Walenn, J. (1990). Passport to Cambridge certificate in advanced english. Macmillan.

Cita Chicago Style (17a ed.)

Walenn, Jeremy. Passport to Cambridge Certificate in Advanced English. Londres: Macmillan, 1990.

Cita MLA (8a ed.)

Walenn, Jeremy. Passport to Cambridge Certificate in Advanced English. Macmillan, 1990.