Traddodwyd y ddarlith = Lecture delivered: Ysgol Bro Lleu, 12/10/1995.
Datblygiadau cynnar botaneg yn Eryri by Dewi Jones. ISBN 1870470222. Published by Cyngor Gwynedd, Adran Addysg a Diwylliant in 1996. Publication and catalogue information, links to buy online and reader comments.