“Extract (translated) from a letter from Professor Bessel to Sir J. F. W. Herschel, Bart. dated Königsberg, January 22, 1844”. Monthly Notices of the Royal Astronomical Society (Oxford University Press (OUP)) 6 (5): 62-64. (1844). Bibcode: 1844MNRAS...6...62.. doi:10.1093/mnras/6.5.62. ISSN0035-8711.
“Extract (translated) from a letter from Professor Bessel to Sir J. F. W. Herschel, Bart. dated Königsberg, January 22, 1844”. Monthly Notices of the Royal Astronomical Society (Oxford University Press (OUP)) 6 (5): 62-64. (1844). Bibcode: 1844MNRAS...6...62.. doi:10.1093/mnras/6.5.62. ISSN0035-8711.
“Extract (translated) from a letter from Professor Bessel to Sir J. F. W. Herschel, Bart. dated Königsberg, January 22, 1844”. Monthly Notices of the Royal Astronomical Society (Oxford University Press (OUP)) 6 (5): 62-64. (1844). Bibcode: 1844MNRAS...6...62.. doi:10.1093/mnras/6.5.62. ISSN0035-8711.