Klosterman, Chuck (2009). Eating the Dinosaur (1st Scribner hardcover ed.). New York: Scribner. pp. 60–62. ISBN9781439168486.
Everett, Allen; Roman, Thomas (2012). Time Travel and Warp Drives. Chicago: University of Chicago Press. pp. 136–139. ISBN978-0-226-22498-5.
Smeenk, Chris; Wüthrich, Christian (2011), "Time Travel and Time Machines", in Callender, Craig (ed.), The Oxford Handbook of Philosophy of Time, Oxford University Press, p. 581, ISBN978-0-19-929820-4
Rea, Michael (2014). Metaphysics: The Basics (1. publ. ed.). New York: Routledge. p. 78. ISBN978-0-415-57441-9.