O. Folarin, D. G. Adewumi, and A. K. Oluwatoyin, “Glutathione-S-transferase production in earthworm (Annelida: Eudrilidae) as a tool for heavy metal pollution assessment in abattoir soil”, Rev. Biol. Trop., vol. 64, no. 2, pp. 779–789, Jun. 2016.