Koteja, J. 1974b Comparative studies on the labium in the Coccinea (Homoptera).. Zeszyty Naukowe Akademii Rolniczej w Warszawie, Rozprawy Naukowe 89: 1-162.

Notes: Detailed study with illustrations; key to superfamilies, families and other high categories; lists examined species; classification of scale insects based on characters of labium.