Chan, M. K., N. A. Fadzil, A. L. Chew, and B. Y. Khoo. “New Molecular Biologist Perspective and Insight: DNA Topoisomerases Production by Recombinant DNA Technology for Medical Laboratory Application and Pharmaceutical Industry”. Electronic Journal of Biotechnology, vol. 16, no. 6, Nov. 2013, doi:10.2225/vol16-issue6-fulltext-6.