1. W.R. Hamilton, On a new species of imaginary quantities connected with the theory of quaternions. In: Halberstam and Ingram [13], pp. 111-116 (Chapter 5). First published as [2].
2. Hamilton W.R.: On a new species of imaginary quantities connected with the theory of quaternions. Proceedings of the Royal Irish Academy 2, 424-434 (1844)
3. W. R. Hamilton, On quaternions. In: Halberstam and Ingram [13] , chapter 8, pages 227-297. First published in various articles in Philosophical Magazine, 1844-1850.
4. Philip Kelland and Peter Guthrie Tait, Introduction to quaternions. Macmillan, London, 3rd edition, 1904.
5. W. R. Hamilton, Researches respecting quaternions. First series (1843). In Halberstam and Ingram [13] , chapter 7, pages 159-226. First published as [14] .