Não informado. (1839). Memoirs of the Geological Survey of the United Kingdon. Institute of Geological Sciences.
Παραπομπή σε μορφή Chicago (17η εκδ.)Não informado. Memoirs of the Geological Survey of the United Kingdon. London: Institute of Geological Sciences, 1839.
Παραπομπή σε μορφή MLA (8th εκδ.)Não informado. Memoirs of the Geological Survey of the United Kingdon. Institute of Geological Sciences, 1839.
Πρόσοχή: Οι παραπομπές μπορεί να μην είναι 100% ακριβείς.