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. 2614, 1 (Sep. 2010), 46–52. DOI:https://doi.org/10.11646/zootaxa.2614.1.4.