Michell, J. (1751). A treatise of artificial magnets: In which is shewn an easy and expeditious method of making them, superior to the best natural ones : ... and also, a way of improving the natural ones, and of changing or converting their poles ... (The second edition, corrected and improved.). printed by Joseph Bentham; and sold by W. and J. Mount, and T. Page, J. & P. Knapton, C. Bathurst, J. Beecroft, London; W. Thurlbourn, and T. Merrill, in Cambridge; J. Fletcher, at Oxford; and J. Hildyard, at York.

Michell, John. A Treatise of Artificial Magnets: In Which Is Shewn an Easy and Expeditious Method of Making Them, Superior to the Best Natural Ones : ... and Also, a Way of Improving the Natural Ones, and of Changing or Converting Their Poles ... The second edition, corrected and improved. printed by Joseph Bentham; and sold by W. and J. Mount, and T. Page, J. & P. Knapton, C. Bathurst, J. Beecroft, London; W. Thurlbourn, and T. Merrill, in Cambridge; J. Fletcher, at Oxford; and J. Hildyard, at York, 1751.