Kuwana, S.I. 1922 Studies on Japanese Monophlebinae. Contribution I: The genus Warajicoccus.. Bulletin of Agriculture and Commerce, Imperial Plant Quarantine Station, Yokohama 1: 1-58.

Notes: Detailed study of classification: keys to various stages of 3 species; Warajicoccus n. gen. [actually =Drosicha]; W. howardi, W. pinicola n. spp.