^ 1.01.11.21.31.41.51.61.7Tiantian Yuan; Johan Richard; Anshu Gupta; Christoph Federrath; Soniya Sharma; Brent A. Groves; Lisa J. Kewley; Renyue Cen; Yuval Birnboim; David B. Fisher. The most ancient spiral galaxy: a 2.6-Gyr-old disk with a tranquil velocity field. The Astrophysical Journal. 30 October 2017, 850: 61. Bibcode:2017ApJ...850...61Y. arXiv:1710.11130. doi:10.3847/1538-4357/aa951d.
^The most ancient spiral galaxy confirmed. PhysOrg. 3 November 2017 [2017-12-30]. (原始内容于2018-01-01).