Aina, O., E. Agbaji, and N. Nwokem. “Biodegradation of Naphthalene Using Pseudomonas Putida and Bacillus Subtilis Immobilized on Snail Shell”. Journal of Applied Sciences and Environmental Management, vol. 22, no. 7, Aug. 2018, pp. 1065-70, doi:10.4314/jasem.v22i7.12.