1. Watson J.D. and Crick F.H.C., “A Structure for Deoxyribonucleic Acid”, Nature, 171 737–8, 1953
2. Watson J.D. The Double Helix, Norton Critical Edition, Ed. Gunther S. Stent, New York and London, W.W. Norton and Company, 1980
3. Maddox, Brenda, Rosalind Franklin: The Dark Lady of DNA, New York, HarperCollins, 2002
4. Vologodskii, A. Topology and Physics of Circular DNA, Boca Raton, CRC Press, 1992
5. Stasiak, A. “Circular DNA”, in Large Ring Molecules, Ed. J.A. Semlyen, Chichester, John Wiley and Sons, 1996