>> M.E. Braithwaite & K.J. Walker. 2012. 50 years of mapping the British and Irish flora.
>> Changes in the Berwickshire Flora (conference paper by Michael Braithwaite)
>> W.T. Stearn. 1986. John Ray’s Natural History Travels.
>> J.E. Lousley. 1957. Progress in the study of the British flora.
>> J.E. Lousley. 1950. Distribution of British plants.
>> T.C.G. Rich & E.R. Woodruff. 1990. BSBI Monitoring Scheme 1987-88. Report the Nature Conservancy Council.