“A List of the Species of the Tribe Aphidini, Family Aphidae, Found in the United States, Which Have Been Heretofore Named, With Descriptions of Some New Species”. Illinois Natural History Survey Bulletin 1, no. 2 (December 13, 1877): 3–16. Accessed May 17, 2024. https://iopn.library.illinois.edu/journals/inhs/article/view/448.