Eddy, Matthew Daniel. "Diagrams". in Anthony Grafton, Ann Blair and Anja Sylvia Goeing (Eds.), A Companion to the History of Information (Princeton: Princeton University Press, 2020), 397-401. Cite journal requires |journal= (bantuan)
aubg.edu
"Subject Week". www.aubg.edu (dalam bahasa Inggeris). November 21, 2020. Dicapai pada 2021-01-28.
Eddy, Matthew Daniel. "Diagrams". in Anthony Grafton, Ann Blair and Anja Sylvia Goeing (Eds.), A Companion to the History of Information (Princeton: Princeton University Press, 2020), 397-401. Cite journal requires |journal= (bantuan)