Nicholls, Mark (2009). “The 'Wizard Earl' in Star Chamber: The Trial of the Earl of Northumberland, June 1606”. The Historical Journal30 (1): 173–189. doi:10.1017/S0018246X00021968. ISSN0018-246X.
Nicholls, Mark (2009). “The 'Wizard Earl' in Star Chamber: The Trial of the Earl of Northumberland, June 1606”. The Historical Journal30 (1): 173–189. doi:10.1017/S0018246X00021968. ISSN0018-246X.