Cita APA (7a ed.)

Kingsbury, R. (1990). Longman First Certificate Coursebook. Longman.

Cita Chicago Style (17a ed.)

Kingsbury, Roy. Longman First Certificate Coursebook. Essex: Longman, 1990.

Cita MLA (9a ed.)

Kingsbury, Roy. Longman First Certificate Coursebook. Longman, 1990.