Carlyle 1897, p. 202. Carlyle, Thomas (1897). "Letters I (1) to LXXXVI (86)". Oliver Cromwell's letters and speeches: with elucidations. Vol. 1. London: Chapman and Hall. p. 202.
Firth & Rait 1911, p. 381. Firth, C.H.; Rait, R.S., eds. (1911). "February 1644: An Ordinance for the appointing a Committee of both Houses of Parliament, to join with the Committees and Commissioners of Scotland, for the better managing the Affairs of both Nations, in the common Cause, according to the Ends expressed in the late Covenant and Treaty between the Two Nations of England and Scotland". Acts and Ordinances of the Interregnum, 1642–1660. pp. 381, 382.