Wells, E. (1731). The Young Gentleman's Trigonometry, Mechanicks, und Opticks, containing Such Elements of the said Arts or Sciences, as are most Useful and Easy to be known. By . (The Second Edition.). London: J. Knapton.

Wells, Edward. The Young Gentleman's Trigonometry, Mechanicks, Und Opticks, Containing Such Elements of the Said Arts or Sciences, As Are Most Useful and Easy to Be Known. By . The Second Edition. London: J. Knapton, 1731.

Wells, Edward. The Young Gentleman's Trigonometry, Mechanicks, Und Opticks, Containing Such Elements of the Said Arts or Sciences, As Are Most Useful and Easy to Be Known. By . The Second Edition. London: J. Knapton, 1731.