PBSWiki - Ornithogalum
- Notes on the cultivation of the different groups within the genus Ornithogalum, with photographs of various species and hybrids uploaded by members of the Pacific Bulb Society.
- http://www.pacificbulbsociety.org/pbswiki/index.php/Ornithogalum

Osteospermum - Wikipedia
- An account of the genus Osteospermum, with a list of species and advice on cultivation.
- http://en.wikipedia.org/wiki/Osteospermum