Griffith 2019. Griffith, Rhys (2019). "Proceedings, 2019"(PDF). Transactions of the Woolhope Naturalists' Field Club. 67: 16–17. Archived(PDF) from the original on 29 December 2021. Retrieved 29 December 2021.
Griffith 2019. Griffith, Rhys (2019). "Proceedings, 2019"(PDF). Transactions of the Woolhope Naturalists' Field Club. 67: 16–17. Archived(PDF) from the original on 29 December 2021. Retrieved 29 December 2021.