- Childs, Craig. 2000. The Secret Knowledge of Water. Little, Brown and Company, Boston. (p. 183). Signal #2
- McFarlane, Robert. 2007. The Wild Places. Penguin Books. Signal #4
- McPhee, John. 1998. Annals of the Former World. Farrar, Straus and Giroux, New York. (p. 440). Signal #3
- Nials, Fred. 1993. Personal communication, somewhere in the Black Rock Desert. Signal #1