Dauben, Joseph W. and Scriba, Christoph J. eds. (2002) Writing the History of Mathematics – Its Historical Development. Birkhaeuser. p. 33. ISBN978-3764361662
Rizo-Patron, Eileen; Casey, Edward S. and Wirth, Jason M. eds. (2017) Adventures in Phenomenology: Gaston Bachelard, SUNY Press. p. 123 n. 11. ISBN9781438466057