Nathan P. Havill & Robert G. Foottit (2007): Biology and Evolution of Adelgidae. Annual Review of Entomology 52: 325–349. doi:10.1146/annurev.ento.52.110405.091303
Masakazu Sano, Nathan P. Havill, Kenichi Ozaki (2011): Taxonomic identity of a galling adelgid (Hemiptera: Adelgidae) from three spruce species in Central Japan. Entomological Science 14: 94–99. doi:10.1111/j.1479-8298.2010.00417.x
redia.it
O.E. Heie & P. Wegierek (2009): Diagnoses of the higher taxa of Aphidomorpha (Hemiptera Sternorrhyncha). Redia XCII: 261-269 download
Ole E. Heie & Piotr Wegierek (2009): A classification of the Aphidomorpha (Hemiptera, Sternorrhyncha). Redia XCII: 69–77. download