Links to articles about St Harmon area appearing in the Radnorshire Society Transactions via Welsh Journals Online
Dyrysgol, St Harmons, Sir Cyril Fox 1940 
An Early Charter of the Abbey of Cymhir, B G Charles 1970
Who was St Harmon?  R W D Fenn 1966
The Parish and Place Names of St Harmon ,Jonathan Argoed Pugh 1934
St Harmon Before and After Kilvert, RogerL Brown 1993 
A Faithful Vicar of St Harmon, David H Williams 2001
The Boundary of the Medieval Grange of Dolhelfa, David Percival 1993 Agriculture and Change in a Nineteenth Century Radnorshire Valley , Tim Thompson 1999