Day, A. J., & Hoffman, V. (1991). The annual register: A record of world events 1990. Longman.
芝加哥风格引文Day, Alan J., 与 Verena Hoffman. The Annual Register: A Record of World Events 1990. London, [England]: Longman, 1991.
MLA引文Day, Alan J., 与 Verena Hoffman. The Annual Register: A Record of World Events 1990. Longman, 1991.
警告：这些引文格式不一定是100％准确.