Tham khảo Butan

  1. ↑ “Occ paper” (PDF). www.chem.qmul.ac.uk. 
  2. ↑ Watts, H. (1868). Dictionary of Chemistry 4. tr. 385. 
  3. ↑ Maybery, C.F. (1896). “On the Composition of the Ohio and Canadian Sulphur Petroleums”. Proceedings of the American Academy of Arts and Sciences 31: 1–66. JSTOR 20020618. doi:10.2307/20020618. 
  4. ↑ Roman M. Balabin (2009). “Enthalpy Difference between Conformations of Normal Alkanes: Raman Spectroscopy Study of n-Pentane and n-Butane”. J. Phys. Chem. A 113 (6): 1012–9. PMID 19152252. doi:10.1021/jp809639s.