Brickfields Country Park (24 December 2007). "Oxford Ragwort - Senecio squalidus". Ask Brickfields Country Park a question. Retrieved 14 February 2008.
"Details for Senecio squalidus L."The National Biodiversity Network's Species Dictionary. Natural History Museum, London. 12 August 1994. Retrieved 14 February 2008.
Peter Llewellyn (23 August 2004). "Senecio squalidus Oxford ragwort". Wild Flowers of the British Isles. Wild Flower Society. Retrieved 12 February 2008.
"Senecio squalidus". Artículo de la Enciclopedia Libre Universal en Español (in Spanish). Archived from the original on 17 September 2004. Retrieved 14 February 2008.
"Senecio squalidus". Artículo de la Enciclopedia Libre Universal en Español (in Spanish). Archived from the original on 17 September 2004. Retrieved 14 February 2008.