There are various published sources, which may assist researchers prior to making an appointment to view the archival material:
History of the Middle Temple, edited by Richard O. Havery. Hart Publishing, 2011.
A Calendar of Middle Temple Records, edited by Charles Henry Hopwood. Butterworth & Co., 1903.
The Middle Temple Bench Book, by J. Bruce Williamson. Chancery Lane Press, 1937.
The History of the Temple, London, from the Institution of the Order of the Knights of the Temple to the Close of the Stuart Period, by J. Bruce Williamson. John Murray. Second edition, 1925.