Espinoza-Navarro, O., and E. Bustos-Obregón. 2015. “Environmental Risk and Toxicity Effect of Organophosphorus Insecticides on Male Red Earthworm (Eisenia Foetida)”. International Journal of Medical and Surgical Sciences 2 (4):723-29. https://doi.org/10.32457/ijmss.2015.046.