Rujukan Nebula Ketam

  1. 1 2 3 "M 1 – SuperNova Remnant". SIMBAD. Observatory of Strasbourg. Dicapai pada 12 February 2012.
  2. ↑ Kaplan, David L.; Chatterjee, S.; Gaensler, B. M.; Anderson, J. (2008). "A Precise Proper Motion for the Crab Pulsar, and the Difficulty of Testing Spin-Kick Alignment for Young Neutron Stars". The Astrophysical Journal. 677 (2): 1201–1215. arXiv:0801.1142. Bibcode:2008ApJ...677.1201K. doi:10.1086/529026.
  3. ↑ Hester, J. J. (2008). "The Crab Nebula: An Astrophysical Chimera". Annual Review of Astronomy and Astrophysics. 46: 127–155. Bibcode:2008ARA&A..46..127H. doi:10.1146/annurev.astro.45.051806.110608.
  4. ↑ Parsons, William (1844). "Observations on Some of the Nebulae". Philosophical Transactions of the Royal Society of London. 134. fig. 81, plate xviii, p. 321. doi:10.1098/rstl.1844.0012. JSTOR 108366.