Humphries, John. Search for the Nile's Source The Ruined Reputation of John Petherick, Nineteenth-Century Welsh Explorer. Cardiff: University of Wales Press, 2013. According to WorldCat, the book is held in 411 libraries[2]
Humphries, John. Spying for Hitler The Welsh Double-Cross. Cardiff: University of Wales Press, 2012. According to WorldCat, the book is held in 632 libraries[3]
Humphries, John. The Man from the Alamo: Why the Welsh Chartist Uprising of 1839 Ended in a Massacre. St. Athan: Wales Books, Glyndŵr Pub, 2004.
Humphries, John. Freedom Fighters: Wales's Forgotten 'war', 1963–1993. Cardiff: University of Wales Press, 2008.