1. Aitken, R.B. (1918). The Binary Stars. New York: McMurtrie.
2. Alexander, A.F.O’D. (1965). The Planet Uranus. A History of Observation, Theory and Discovery. London: Faber & Faber.
3. Andropoulos, J. & Orchiston, W. (2006). Melbourne Observatory and the genesis of astrophysics in Australia. Anglo-Australian Observatory Newsletter, 109, 18–20.
4. Antoniadi, E.M., 1974. The Planet Mercury. Shaldon: Reid.
5. Archibald, R.C. (1924). Simon Newcomb 1839–1909. Biography of his life and work. Memoirs of the National Academy of Sciences, 17, 19–69.