Brassica campestris
- Illustration, systematic position, morphology, biology, distribution, ecology and economic significance of Wild Turnip.
- http://www.agroatlas.spb.ru/weeds/Brassica_campestris_en.htm

Brassica juncea
- Photograph, systematic position, morphology, biology, distribution, ecology and economic significance of Indian Mustard.
- http://www.agroatlas.spb.ru/weeds/Brassica_juncea_en.htm

Brassica sinapis
- Several photographs of Charlock, sometimes classified as Sinapis arvensis, and its identifying features.
- http://www.plant-identification.co.uk/skye/cruciferae/sinapis-arvensis.htm

Brassica
- Photographs and description of Brassica oleracea (cabbage), B napus (Rape, Swede) and B rapa (Turnip) which are sometimes found as escapes from cultivation.
- http://www.plant-identification.co.uk/skye/cruciferae/brassica.htm

History of Cabbage
- Short discussion of Brassica oleracea and its domestication.
- http://gardenline.usask.ca/veg/cabbage.html

BBSRC Brassica Genome Project
- A project to map and work with parts of the Brassica genome.
- http://brassica.bbsrc.ac.uk/