Lagos, D. M., Puttler, B., Voegtlin, D. J. and Giordano, R. (2012) “A new species of Aphis (Hemiptera:Aphididae) in Missouri on St. John’s Wort, Hypericum kalmianum, and re-description of Aphis hyperici Monell”, Zootaxa. Auckland, New Zealand, 3478(1), pp. 81–92. doi: 10.11646/zootaxa.3478.1.10.