↑ 2,02,12,22,32,42,52,6
B. C. Whitmore; R. A. Lucas; D. B. McElroy; T. Y. Steiman-Cameron; P. D. Sackett; R. P. Olling (1990). „New observations and a photographic atlas of polar-ring galaxies“. Astronomical Journal. 100: 1489–1522, 1721–1755. Bibcode:1990AJ....100.1489W. doi:10.1086/115614.
↑
J. L. Sérsic (1967). „Southern Peculiar Galaxies III“. Zeitschrift für Astrophysik. 67: 306–311. Bibcode:1967ZA.....67..306S.
↑ 4,04,1
B. C. Whitmore; D. B. McElroy; F. Schweizer (1987). „The shape of the dark halo in polar-ring galaxies“. Astrophysical Journal. 314: 439–456. Bibcode:1987ApJ...314..439W. doi:10.1086/165077.
↑
F. Schweizer; B. C. Whitmore; V. C. Rubin (1983). „Colliding and merging galaxies. II - S0 galaxies with polar rings“. Astronomical Journal. 88: 909–925. Bibcode:1983AJ.....88..909S. doi:10.1086/113377.