Rujukan M33

  1. 1 2 S. J. O'Meara (1998). The Messier Objects. Cambridge: Cambridge University. ISBN 0-521-55332-6. 
  2. ↑ "NASA Spitzer Telescope Reveals Pinwheel Galaxy's Hidden Wonders". Dicapai 2007-04-07. 
  3. ↑ "SIMBAD Astronomical Database". Results for Messier 101. Dicapai 2007-04-07. 
  4. ↑ "Messier Object 101". Dicapai 2007-04-07. 
  5. ↑ "Best of AOP: M101: Pinwheel Galaxy". Dicapai 2007-04-07. 
  6. ↑ Brunthaler, Andreas; Reid, Mark J.; Falcke, Heino; Greenhill, Lincoln J.; Henkel, Christian (2005). "The Geometric Distance and Proper Motion of the Triangulum Galaxy (M33)". Science. 307 (5714): 1440–1443. doi:10.1126/science.1108342. PMID 15746420. Selenggaraan CS1: Pelbagai nama: senarai pengarang (link)
  7. ↑ Morcone, Jennifer, Heaviest Stellar Black Hole Discovered in Nearby Galaxy, Chandra X-ray Observatory press release, 2007-10-17
  8. ↑ Ho, Luis C.; Filippenko, Alexei V.; Sargent, Wallace L. W. (October 1997), "A Search for "Dwarf" Seyfert Nuclei. III. Spectroscopic Parameters and Properties of the Host Galaxies", The Astrophysical Journal Supplement Series, 112: 315–390, doi:10.1086/313041  Lebih daripada satu |author= dan |last1= dinyatakan (bantuan); Lebih daripada satu |periodical= dan |journal= dinyatakan (bantuan)Selenggaraan CS1: Tarikh dan tahun (link)
  9. ↑
  10. ↑
  11. ↑ McConnachie, A. W.; Irwin, M. J.; Ferguson, A. M. N.; Ibata, R. A.; Lewis, G. F.; Tanvir, N. (May 2004), "Determining the location of the tip of the red giant branch in old stellar populations: M33, Andromeda I and II", Monthly Notices of the Royal Astronomical Society, 350 (1): 250, doi:10.1111/j.1365-2966.2004.07637.x Selenggaraan CS1: Menggunakan parameter authors (link) Selenggaraan CS1: Tarikh dan tahun (link)
  12. ↑
  13. ↑