^Paturel G.; Dubois P.; Petit C.; Woelfel F. (2002), Comparison LEDA/SIMBAD octobre 2002. Catalogue to be published in 2003 (بالإنجليزية), Bibcode:2002LEDA.........0P, QID:Q66470150
^Ned Team (1992), Redshift obtained from literature by the Ned team prior to november 1992 (بالإنجليزية), vol. 1, p. 1, Bibcode:1992NEDR....1....1N, QID:Q66617624