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James (1856). “On the Deflection of the Plumb-Line at Arthur's Seat, and the Mean Specific Gravity of the Earth”. Proceedings of the Royal Society. 146: 591–606. doi:10.1098/rstl.1856.0029. JSTOR108603.
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Maskelyne, N. (1772). “A proposal for measuring the attraction of some hill in this Kingdom”. Philosophical Transactions of the Royal Society. 65: 495–499. Bibcode:1775RSPT...65..495M. doi:10.1098/rstl.1775.0049.
James (1856). “On the Deflection of the Plumb-Line at Arthur's Seat, and the Mean Specific Gravity of the Earth”. Proceedings of the Royal Society. 146: 591–606. doi:10.1098/rstl.1856.0029. JSTOR108603.