American Library Association & Article 19 (Organization). (1991). Information freedom and censorship: World report 1991. American Library Association.
芝加哥风格引文American Library Association 与 Article 19 (Organization). Information Freedom and Censorship: World Report 1991. Chicago: American Library Association, 1991.
MLA引文American Library Association 与 Article 19 (Organization). Information Freedom and Censorship: World Report 1991. American Library Association, 1991.
警告：这些引文格式不一定是100％准确.