P. Beacham and N. Pevsner, The Buildings of England: Cornwall, New Haven and London 2014, 464-65.
W. Dugdale, Monasticon anglicanum, or, The history of the ancient abbies, monasteries, hospitals, cathedral and collegiate churches, with their dependencies in England and Wales, London 1718, 115-6.
T. Easton, 'Apotropaic symbols and other measures for protecting buildings against misfortune', in Physical evidence for ritual acts, sorcery and witchcraft in Christian Britain: a feeling for magic, ed. by R. Hutton, Basingstoke 2015, 39-67, especially 45-7.
F. C. Hingeston-Randolph, The registers of Walter Bronescombe (A.D. 1257-1280), and Peter Quivil (A.D. 1280-1291), bishops of Exeter, with some records of the episcopate of Bishop Thomas de Bytton (A.D. 1292-1307); also the taxation of Pope Nicholas IV, A.D. 1291 (dioceseof Exeter), London 1889, 295.
Historic England Listed Building: English Heritage Legacy ID: 61888
G. Oliver, Monasticon Diocesis Exoniensis, being a collection of records and instruments illustrating the ancient conventuel, collegiate, and eleemosynary foundations, in the counties of Cornwall and Devon, London and Exeter 1846, 442.
N. Pevsner, The Buildings of England: Cornwall, Harmondsworth 1951, 149.
E. H. Sedding, Norman architecture in Cornwall; a handbook to old Cornish ecclesiastical architecture, with notes on ancient manor-houses, London 1909, 345.