==References==* Monthly Notices of the Royal Astronomical Society 83 (1923) 233* The Observatory 45 (1922) 77* Publications of the Astronomical Society of the Pacific 34 (1922) 138==External links==* Online catalogue of Christie's working papers (part of the Royal Greenwich Observatory Archives held at Cambridge University Library)
Od 1880 do 1882 je bil njen tajnik, med 1888 in 1890 pa njen predsednik.