- 1953 . Isaac Newton's Letters . Manchester Guardian , October : 4 – 4 . Saturday, 3 Professor Turnbull here announced his intention of printing the longer document in the Correspondence; but he has kindly consented to a preliminary publication in this form.
- 1888 . A Catalogue of the Portsmouth Collection of Books and Papers written by or belonging to Sir Isaac Newton 1 – 1 . Cambridge section I, I, 5. Present pressmark MS Add 3958 (5), fol. 87. The papers are not ‘unsorted’, as Professor Turnbull stated, but they were imperfectly analysed by the cataloguers of 1888.
- Dugas , René . 1954 . La Mécanique au XVIIe siècle 359 – 360 . Paris CEuvres Complètes de Christiaan Huygens, viii, pp. 325–332.
- Brewster , David . 1855 . Memoirs … of Sir Isaac Newton Vol. i , 451 – 451 . Edinburgh Huygens, Œuvres Complètes, vii, p. 326n.
- Rigaud , S.P. 1838 . Historical Essay on the first publication of Sir Isaac Newton's Principia Oxford Appendix, pp. 28, 40. Cf. also the discussion of Florian Cajori in “Newton's Twenty Years' Delay in Announcing the Law of Gravitation”, Sir Isaac Newton, 1727–1927, London, 1928, pp. 172–175.
- Cajori . 1928 . “ Newton's Twenty Years' Delay in Announcing the Law of Gravitation ” . In Sir Isaac Newton, 1727–1927 173 – 173 . London 175
- Dugas . 1954 . La Mécanique au XVIIe Siècle 360 – 360 . Paris
Annals of Science
Volume 13, 1957 - Issue 1