Thompson, Sandra A., Joseph Sung-Yul Park & Charles N. Li. 2006. A Reference Grammar of Wappo. (University of California Publications in Linguistics, 138.) Berkeley and Los Angeles: University of California Press. xviii+172pp.
http://repositories.cdlib.org/cgi/viewcontent.cgi?article=1006&context=ucpress/ucpl
@book{thompson2006wappo,
address = {Berkeley and Los Angeles},
author = {Sandra A. Thompson and Joseph Sung-Yul Park and Charles N. Li},
pages = {xviii+172},
publisher = {University of California Press},
series = {University of California Publications in Linguistics},
title = {A Reference Grammar of Wappo},
url = {http://repositories.cdlib.org/cgi/viewcontent.cgi?article=1006&context=ucpress/ucpl},
volume = {138},
year = {2006}
}