1. Barwise, J., & Etchemendy, J. (1991). Visual information and valid reasoning. In: W. Zimmerman, & S. Cunningham (Eds.), Visualisation in teaching and learning mathematics (pp. 9–24). Washington, DC: MAA.
2. Barwise, J., & Etchemendy, J. (1996). Heterogeneous logic. In: G. Allwain, & J. Barwise (Eds.), Logical reasoning with diagrams (pp. 179–201). New York: Oxford University Press.
3. Biehler, R., Scholz, R. W., Strässer, R., & Winkelmann, B. (Eds.). (1994). Didactics of mathematics as a scientific discipline. Dordrecht: Kluwer Academic Publishers. .
4. Borwein, P., & Jörgenson, L. (2001). Visible structures in number theory. American Mathematical Monthly, 108, 897–911
5. Brown, J. R. (1997). Proofs and pictures. British Journal for the Philosophy of Science, 48, 161–180.