State of Victoria (Agriculture Victoria) (2020-08-18). "Giant Viper's-bugloss (Echium pininana)". vro.agriculture.vic.gov.au. Victoria State Government. Archived from the original on 2019-03-26. Retrieved 2021-06-19.
Woodley, Millie (11 January 2021). "Plant of the month". Fulham Palace. Fulham Palace Trust. Archived from the original on 2021-01-11. Retrieved 2021-06-19.
gardenersworld.com
"Echium pininana". BBC Gardeners' World Magazine. Retrieved 2021-06-19.
Tweddle, John (2004-03-29). "Echium pininana Webb & Berthel". Natural History Museum. The Trustees of The Natural History Museum, London. Archived from the original on 2021-06-24. Retrieved 2021-06-19.
Tweddle, John (2004-03-29). "Echium pininana Webb & Berthel". Natural History Museum. The Trustees of The Natural History Museum, London. Archived from the original on 2021-06-24. Retrieved 2021-06-19.
Woodley, Millie (11 January 2021). "Plant of the month". Fulham Palace. Fulham Palace Trust. Archived from the original on 2021-01-11. Retrieved 2021-06-19.
State of Victoria (Agriculture Victoria) (2020-08-18). "Giant Viper's-bugloss (Echium pininana)". vro.agriculture.vic.gov.au. Victoria State Government. Archived from the original on 2019-03-26. Retrieved 2021-06-19.