Analysis of information sources in references of the Wikipedia article "Chinese Consolidated Benevolent Association" in English language version.
New Rules of the Yeung-Wo Ui-Kun (1854)
The [Chinese] Six Companies, organized in the 1850s and formally established in 1882, were an amalgamation of the six most important Chinese organizations, or "district associations," in California at the time: the Sam Yup, Yeung Wo, Kong Chow, Ning Yuen, Hop Wo, and Yan Wo.