Cock, M. J. W., Shaw, R. H. and Blackman, R. L. (2010) “On the biology of Ceratopemphigus zehntneri Schouteden (Hemiptera: Aphididae), a gall-forming aphid on Ligustrum robustum subsp. walkeri (Oleaceae), in Sri Lanka”, Zootaxa. Auckland, New Zealand, 2614(1), pp. 46–52. doi: 10.11646/zootaxa.2614.1.4.