Elaeagnaceae
- Botanical characteristics of this family of trees and shrubs with technical drawings of Eleagnus angustifolia and Hippophae rhamnoides.
- http://delta-intkey.com/angio/www/elaeagna.htm

Shepherdia argentea
- Includes distribution and occurrence, botanical and ecological characteristics, value and use, and fire ecology.
- http://www.fs.fed.us/database/feis/plants/shrub/shearg/