Goward, K.J. (2005). "G B Airy's Country Retreat". Institute of Astronomy. University of Cambridge. Archived from the original on 7 August 2007. Retrieved 9 September 2007.
Chapman, Allan (June 2003). "Porters, watchmen, and the crime of William Sayers: the non-scientific staff of the Royal Observatory, Greenwich, in Victorian times". Journal of Astronomical History and Heritage. 6 (1). James Cook University: 27. Bibcode:2003JAHH....6...27C. doi:10.3724/SP.J.1440-2807.2003.01.03. S2CID162033494.
Chapman, Allan (January 1998). "The Female Touch". Astronomy Now. 12 (1): 43–47. Bibcode:1998AsNow..12...43C.
Chapman, Allan (June 2003). "Porters, watchmen, and the crime of William Sayers: the non-scientific staff of the Royal Observatory, Greenwich, in Victorian times". Journal of Astronomical History and Heritage. 6 (1). James Cook University: 27. Bibcode:2003JAHH....6...27C. doi:10.3724/SP.J.1440-2807.2003.01.03. S2CID162033494.
Chapman, Allan (June 2003). "Porters, watchmen, and the crime of William Sayers: the non-scientific staff of the Royal Observatory, Greenwich, in Victorian times". Journal of Astronomical History and Heritage. 6 (1). James Cook University: 27. Bibcode:2003JAHH....6...27C. doi:10.3724/SP.J.1440-2807.2003.01.03. S2CID162033494.
Goward, K.J. (2005). "G B Airy's Country Retreat". Institute of Astronomy. University of Cambridge. Archived from the original on 7 August 2007. Retrieved 9 September 2007.