Cita APA (7a ed.)

Acklan, R. (1989). Thisk first certificate. Longman Group UK limited.

Cita Chicago Style (17a ed.)

Acklan, Richard. Thisk First Certificate. London: Longman Group UK limited, 1989.

Cita MLA (9a ed.)

Acklan, Richard. Thisk First Certificate. Longman Group UK limited, 1989.