Actually, why not screw appearances and just state the obvious: No really serious writer should be without an OED, whether it’s bought or stolen or hacked into the online version of or whatever you need to do. Nothing else comes close.
– David Foster Wallace, “Twenty-Four Word Notes” (in Both Flesh and Not: Essays, 2012)
Updated note from me: if you have a library card, there's a good chance it comes with free OED access. That's how I use it.