Castell a pharc gwledig Craig-y-nos : taith hunan-dywys o amgylch yr ystad sy'n edrych ar yr hanes a'r tirlun = Craig-y-nos castle and country park : a self-guided tour of the estate looking at histor. Published by Brecon Beacons National Park in 2004. Publication and catalogue information, links to buy online and reader comments.