Scale Insect
- Article from Wikipedia on these scale-like parasites of plants which feed on sap drawn directly from the plant's vascular system.
- http://en.wikipedia.org/wiki/Scale_insect

Discover Life - Homoptera
- Offers checklists, images, identification guides and maps. Includes references.
- http://www.discoverlife.org/nh/tx/Insecta/Homoptera/

Psyllids (Psylloidea)
- Information on the Psylloidea, hemipteroid sap-sucking insects called psyllids or jumping-plant lice.
- http://www.psyllids.org/

O. Orkin Insect Zoo - Homoptera
- Offers a student reference guide. Includes a taxonomy.
- http://insectzoo.msstate.edu/Students/homoptera.html

BugBios - Index of the Order Homoptera
- Offers macrophotography combined with descriptions.
- http://www.insects.org/entophiles/homoptera/

Families of Homoptera
- Presents morphological characters for identifying insects in the order Homoptera. Includes references.
- http://eny3005.ifas.ufl.edu/lab1/Homoptera/Homoptera.htm