Wieczorek, K. 2009. Description of sexuales of <i>Sipha (Sipha) littoralis</i> (Walker, 1848) (Aphididae: Chaitophorinae) with remarks on its distribution and host plants. Entomologica Fennica. 20, 2 (Jun. 2009), 100–104. DOI:https://doi.org/10.33338/ef.84467.