FactFinder. [2011-04-10]. (原始内容存档于2020-02-12). California Code of CivilProcedure, Section 412.20(6). Legislative Counsel, State of California. [2007-12-17]
(原始内容存档于2021-03-18). Joseph Ragland, Outline of the Jurisdiction and Procedure of the Federal Courts (1917), p. 112, §80. Alabama Appellate Courts Technology