↑ Soanes, Stevenson (2008). Concise Oxford English dictionary. Oxford University Press. tr. 1501. ISBN0199548412.
↑ Silverblatt, Art (2007). Genre Studies in Mass Media: A Handbook. M. E. Sharpe. tr. 211. ISBN9780765616708. 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.
↑ From the foreword to Ender's Shadow, at Orson Scott Card's official website. "This book is, strictly speaking, not a sequel, because it begins about where Ender's Game begins, and also ends, very nearly, at the same place. In fact, it is another telling of the same tale, with many of the same characters and settings, only from the perspective of another character. It's hard to know what to call it. A companion novel? A parallel novel? Perhaps a 'parallax,'..."
↑ Imagine Publishing. Classic Videogame Hardware Genius Guide. Imagine Publishing. pp. 535–. ISBN 978-1-908222-22-0. Truy cập ngày 30 tháng 7 năm 2013.
