2014

• CyhoeddwydSlow and cold in the true service of God’: Popular Beliefs and Practices, Conformity, and Reformation, c.1530–1600
  Olson, K. K., Olson, K., Armstrong, R. (Golygydd) & O hAnnrachain, T. (Golygydd), 1 Gorff 2014, Christianities in the Early Modern Celtic World. 2014 gol. Palgrave Macmillan, t. 92-107
  Allbwn ymchwil: Pennod mewn Llyfr/Adroddiad/Trafodion Cynhadledd › Pennod

2012

• Cyhoeddwyd'Y Ganrif Fawr?’: Lay Piety, Literature, and Patronage in Fifteenth- and Sixteenth-Century Wales
  Olson, K. K., 1 Ion 2012, The Church and Literature: Volume 48. 2012 gol. Boydell & Brewer, t. 107-123
  Allbwn ymchwil: Pennod mewn Llyfr/Adroddiad/Trafodion Cynhadledd › Pennod

2011

• CyhoeddwydPolitics, Religion, and the Parish in Tudor England and Wales: A View from the Marches of Wales
  Olson, K. K., 1 Ion 2011, Yn: Recusant History. 31, 4, t. 527-536
  Allbwn ymchwil: Cyfraniad at gyfnodolyn › Erthygl › adolygiad gan gymheiriaid

2008

• Cyhoeddwyd'Ar Ffordd Pedr a Phawl': Welsh Pilgrimage and Travel to Rome, c.1200-c.1530.
  Olson, K. K., 1 Rhag 2008, Yn: Welsh History Review. 24, 2, t. 1-40
  Allbwn ymchwil: Cyfraniad at gyfnodolyn › Erthygl › adolygiad gan gymheiriaid
• CyhoeddwydThe Reluctant Medievalist?
  Olson, K. K., Pryce, H., Jenkins, G. (Golygydd) & Jones, G. J. (Golygydd), 1 Ion 2008, Degrees of Influence: A Memorial Volume for Glanmor Williams. 2008 gol. University of Wales Press, t. 30-57
  Allbwn ymchwil: Pennod mewn Llyfr/Adroddiad/Trafodion Cynhadledd › Pennod