^Gunn, S. J. (2004). "Warbeck, Perkin". Oxford Dictionary of National Biography (online ed.). Oxford University Press. doi:10.1093/ref:odnb/28669. Retrieved 2012-03-08. (Subscription or UK public library membership required.)
^Jones, Timothy Willem; Matthews-Jones, Lucinda (2016). Material Religion in Modern Britain: The Spirit of Things. Springer. p. 50. ISBN 9781137540638.