Majeed Abd Zaid, A., and A. J. Hashim. “Optimal Conditions for Spore-Bound Laccase Production from Local Isolate of Bacillus Subtilis*”. Al-Qadisiyah Journal of Pure Science, Vol. 21, no. 3, July 2017, pp. 42-54, https://journalsc.qu.edu.iq/index.php/JOPS/article/view/19.