1. Hoskin Michael, (ed.), Caroline Herschel's autobiographies (Cambridge, 2003), 71.
2. Hoskin Michael, The Herschel partnership (Cambridge, 2003), 62–63.
3. Herschel JohnMrs, Memoir and correspondence of Caroline Herschel (London, 1876), 305.
4. My small Newtonian sweeper—where is it now ?