1. Admiralty tide tables;Admiralty Hydrographic Department,1996
2. A Practical Guide to the British Flora, 139;Andrew,1984
3. Archaeologia Scotica, 1890. List of donations presented to the Society of Antiquaries for Scotland: donation of H.H. Drummond, December 12th 1831.
4. Shell midden at Braehead, Alloa;Ashmore;Forth Naturalist and Historian,1997
5. History of vegetation;Barber,1976