Analysis of information sources in references of the Wikipedia article "Tiền truyện" in Vietnamese language version.
Prequels focus on the action that took place before the original narrative. For instance, in Star Wars: Episode III – Revenge of the Sith the audience learns about how Darth Vader originally became a villain. A prequel assumes that the audience is familiar with the original—the audience must rework the narrative so that they can understand how the prequel leads up to the beginning of the original.
|format= cần |url= (trợ giúp) (ấn bản thứ 3). Oxford University Press. tháng 3 năm 2012 [March 2007]. Truy cập ngày 19 tháng 4 năm 2012.