card)的主题。而在此前,色情印刷品还局限在雕版、木刻和线版的插画上。 Ashcroft v. The Free Speech Coalition. CaseBrief for Law Students. Casebriefs LLC. [2020-07-03]. (原始内容存档于2020-11-29)
(原始内容存档于2013-07-05). Ministry of Culture, Pakistan 互联网档案馆的存檔,存档日期2007-11-16.. Retrieved on 23 March 2008 Pakistan Monument: a source of attraction for visitors. The Nation