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2. Hamilton WR (1853) Lectures on quaternions. Hodges & Smith, Dublin
3. Hamilton WR (1899–1901) Elements of quaternions, 2nd edn. Longmans, Green & Co., London (Jolly, C.J. (ed.) 2 vols.)
4. Tait PG (1867) An elementary treatise on quaternions. Cambridge University Press, Cambridge
5. Gauss CF (1819) Mutation des Raumes In: Carl Friedrich Gauss Werke, Achter Band, pp 357–361, König. Gesell. Wissen. Göttingen, 1900