Groensteen 2012, p. 130; Morita 2010, p. 33. Groensteen, Thierry (2012) [Originally published in French in 1999]. "The Impossible Definition". In Heer, Jeet; Worcester, Kent (eds.). A Comics Studies Reader. translated by Bart Beaty. University Press of Mississippi. pp. 124–131. ISBN978-1-60473-109-5. Morita, Naoko (2010). "Cultural Recognition of Comics and Comics Studies: Comments on Thierry Groensteen's Keynote Lecture". In Berndt, Jaqueline (ed.). Comics worlds & the world of comics : towards scholarship on a global scale. Global Manga Studies. Vol. 1. International Manga Research Center, Kyoto Seika University. pp. 31–39. ISBN978-4-905187-03-5.
O'Nale 2010, p. 384. O'Nale, Robert (2010). "Manga". In Booker, M. Keith (ed.). Encyclopedia of Comic Books and Graphic Novels: [Two Volumes]. ABC-CLIO. pp. 378–387. ISBN978-0-313-35747-3.