Thompson, S. A., Park, J. S., & Li, C. N. (2006). A reference grammar of Wappo. University of California Press.

Thompson, Sandra A., Joseph Sung-Yul Park, and Charles N. Li. A Reference Grammar of Wappo. Berkeley: University of California Press, 2006.

Thompson, Sandra A., et al. A Reference Grammar of Wappo. University of California Press, 2006.