1. W. R. Hamilton, On a new species of imaginary quantities connected with the theory of quaternions. In: Halberstam and Ingram [17], 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 [17], 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 [17], chapter 7, pages 159–226. First published as [18].