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Levere, Trevor H. (July 1977). "Dr Thomas Beddoes and the Establishment of His Pneumatic Institution: A Tale of Three Presidents". Notes and Records of the Royal Society of London. 32 (1): 41–49. doi:10.1098/rsnr.1977.0005. JSTOR531764. PMID11615622. S2CID27322059.
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Levere, Trevor H. (July 1977). "Dr Thomas Beddoes and the Establishment of His Pneumatic Institution: A Tale of Three Presidents". Notes and Records of the Royal Society of London. 32 (1): 41–49. doi:10.1098/rsnr.1977.0005. JSTOR531764. PMID11615622. S2CID27322059.
"Public Ferry Services". numbersevenboattrips.co.uk. Number Seven Boat Trips. 2011. Archived from the original on 12 October 2011. Retrieved 15 October 2011.