Sarkisov, R.N., Sevumian, A.A., & Mkrtchyan, L.P. 1978 [Albinism and colour variation in the Ararat cochineal insect, Porphyrophora hamelii Brandt (Homoptera: Coccoidea).]. Biologicheskii Zhurnal Armenii 31: 927-930.

Notes: [Summary also in Armenian]. Ratio of albino and other females; fertility of eggs when albino females mated with normal males.