| "Kurt Gödel," Encyclopedia Britannica, 2009. (Print version forthcoming.) |
| "Fictionalism in the Philosophy of Mathematics," Stanford Encyclopedia of Philosophy, 2008. |
| "Philosophy of Mathematics," Encyclopedia Britannica, 2007. (Print version forthcoming.) |
| "Platonism in Metaphysics," Stanford Encyclopedia of Philosophy, 2004 (updated 2009). |