Cita APA

Day, A. J., & Hoffman, V. (1991). The annual register: A record of world events 1990. Longman.

Citación estilo Chicago

Day, Alan J., and Verena Hoffman. The Annual Register: A Record of World Events 1990. London, [England]: Longman, 1991.

Cita MLA

Day, Alan J., and Verena Hoffman. The Annual Register: A Record of World Events 1990. Longman, 1991.